Package org.assertj.core.api

Class AbstractIterableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>,ELEMENT,ELEMENT_ASSERT extends AbstractAssert<ELEMENT_ASSERT,ELEMENT>>

java.lang.Object
org.assertj.core.api.AbstractAssert<SELF,ACTUAL>
org.assertj.core.api.AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>
Type Parameters:
SELF - the "self" type of this assertion class. Please read "Emulating 'self types' using Java Generics to simplify fluent API implementation" for more details.
ACTUAL - the type of the "actual" value.
ELEMENT - the type of elements of the "actual" value.
ELEMENT_ASSERT - used for navigational assertions to return the right assert type.
All Implemented Interfaces:
Assert<SELF,ACTUAL>, Descriptable<SELF>, EnumerableAssert<SELF,ELEMENT>, ExtensionPoints<SELF,ACTUAL>, ObjectEnumerableAssert<SELF,ELEMENT>
Direct Known Subclasses:
AbstractCollectionAssert, ClassBasedNavigableIterableAssert, FactoryBasedNavigableIterableAssert
public abstract class AbstractIterableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>,ELEMENT,ELEMENT_ASSERT extends AbstractAssert<ELEMENT_ASSERT,ELEMENT>> extends AbstractAssert<SELF,ACTUAL> implements ObjectEnumerableAssert<SELF,ELEMENT>
Base class for implementations of ObjectEnumerableAssert whose actual value type is Collection.
Author:
Yvonne Wang, Alex Ruiz, Mathieu Baechler, Joel Costigliola, Maciej Jaskowski, Nicolas François, Mikhail Mazursky, Mateusz Haligowski, Lovro Pandzic, Marko Bekhta

  • Field Details

    • iterables

      protected org.assertj.core.internal.Iterables iterables

  • Constructor Details

    • AbstractIterableAssert

      protected AbstractIterableAssert(ACTUAL actual, Class<?> selfType)

  • Method Details

    • isNullOrEmpty

      public void isNullOrEmpty()
      Verifies that the actual group of values is null or empty.

      Example: 

       // assertions will pass
 List<String> strings = new ArrayList<>();
 assertThat(strings).isNullOrEmpty();
 assertThat(new int[] { }).isNullOrEmpty();

 // assertions will fail
 assertThat(new String[] { "a", "b"}).isNullOrEmpty();
 assertThat(Arrays.asList(1, 2, 3)).isNullOrEmpty();
      Specified by:
      isNullOrEmpty in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>

    • isEmpty

      public void isEmpty()
      Verifies that the actual group of values is empty.

      Example: 

       // assertions will pass
 assertThat(new ArrayList()).isEmpty();
 assertThat(new int[] { }).isEmpty();

 // assertions will fail
 assertThat(new String[] { "a", "b" }).isEmpty();
 assertThat(Arrays.asList(1, 2, 3)).isEmpty();
      Specified by:
      isEmpty in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>

    • isNotEmpty

      public SELF isNotEmpty()
      Verifies that the actual group of values is not empty.

      Example: 

       // assertions will pass
 assertThat(new String[] { "a", "b" }).isNotEmpty();
 assertThat(Arrays.asList(1, 2, 3)).isNotEmpty();

 // assertions will fail
 assertThat(new ArrayList()).isNotEmpty();
 assertThat(new int[] { }).isNotEmpty();
      Specified by:
      isNotEmpty in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • hasSize

      public SELF hasSize(int expected)
      Verifies that the number of values in the actual group is equal to the given one.

      Example: 

       // assertions will pass
 assertThat(new String[] { "a", "b" }).hasSize(2);
 assertThat(Arrays.asList(1, 2, 3)).hasSize(3);

 // assertions will fail
 assertThat(new ArrayList()).hasSize(1);
 assertThat(new int[] { 1, 2, 3 }).hasSize(2);
      Specified by:
      hasSize in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expected - the expected number of values in the actual group.
      Returns:
      this assertion object.

    • hasSizeGreaterThan

      public SELF hasSizeGreaterThan(int boundary)
      Verifies that the number of values in the actual iterable is greater than the given boundary.

      Example: 

       // assertion will pass
 assertThat(Arrays.asList(1, 2, 3)).hasSizeGreaterThan(2);

 // assertion will fail
 assertThat(Arrays.asList(1, 2, 3)).hasSizeGreaterThan(3);
      Specified by:
      hasSizeGreaterThan in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      boundary - the given value to compare the actual size to.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the number of values of the actual iterable is not greater than the boundary.
      Since:
      3.12.0

    • hasSizeGreaterThanOrEqualTo

      public SELF hasSizeGreaterThanOrEqualTo(int boundary)
      Verifies that the number of values in the actual iterable is greater than or equal to the given boundary.

      Example: 

       // assertions will pass
 assertThat(Arrays.asList(1, 2, 3)).hasSizeGreaterThanOrEqualTo(1)
                                   .hasSizeGreaterThanOrEqualTo(3);

 // assertion will fail
 assertThat(Arrays.asList(1, 2, 3)).hasSizeGreaterThanOrEqualTo(4);
      Specified by:
      hasSizeGreaterThanOrEqualTo in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      boundary - the given value to compare the actual size to.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the number of values of the actual iterable is not greater than or equal to the boundary.
      Since:
      3.12.0

    • hasSizeLessThan

      public SELF hasSizeLessThan(int boundary)
      Verifies that the number of values in the actual iterable is less than the given boundary.

      Example: 

       // assertion will pass
 assertThat(Arrays.asList(1, 2, 3)).hasSizeLessThan(4);

 // assertion will fail
 assertThat(Arrays.asList(1, 2, 3)).hasSizeLessThan(3);
      Specified by:
      hasSizeLessThan in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      boundary - the given value to compare the actual size to.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the number of values of the actual iterable is not less than the boundary.
      Since:
      3.12.0

    • hasSizeLessThanOrEqualTo

      public SELF hasSizeLessThanOrEqualTo(int boundary)
      Verifies that the number of values in the actual iterable is less than or equal to the given boundary.

      Example: 

       // assertions will pass
 assertThat(Arrays.asList(1, 2, 3)).hasSizeLessThanOrEqualTo(5)
                                   .hasSizeLessThanOrEqualTo(3);

 // assertion will fail
 assertThat(Arrays.asList(1, 2, 3)).hasSizeLessThanOrEqualTo(2);
      Specified by:
      hasSizeLessThanOrEqualTo in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      boundary - the given value to compare the actual size to.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the number of values of the actual iterable is not less than or equal to the boundary.
      Since:
      3.12.0

    • hasSizeBetween

      public SELF hasSizeBetween(int lowerBoundary, int higherBoundary)
      Verifies that the number of values in the actual iterable is between the given boundaries (inclusive).

      Example: 

       // assertions will pass
 assertThat(Arrays.asList(1, 2, 3)).hasSizeBetween(2, 3)
                                   .hasSizeBetween(3, 4)
                                   .hasSizeBetween(3, 3);

 // assertion will fail
 assertThat(Arrays.asList(1, 2, 3)).hasSizeBetween(4, 6);
      Specified by:
      hasSizeBetween in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      lowerBoundary - the lower boundary compared to which actual size should be greater than or equal to.
      higherBoundary - the higher boundary compared to which actual size should be less than or equal to.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the number of values of the actual iterable is not between the boundaries.
      Since:
      3.12.0

    • hasOnlyOneElementSatisfying

      @Deprecated public SELF hasOnlyOneElementSatisfying(Consumer<? super ELEMENT> elementAssertions)
      Deprecated.
      use singleElement() instead
      Verifies that the unique element of the Iterable satisfies the given assertions expressed as a Consumer, if it does not, only the first error is reported, use SoftAssertions to get all the errors.

      Example: 

       List<Jedi> jedis = asList(new Jedi("Yoda", "red"));

 // assertions will pass

 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> assertThat(yoda.getName()).startsWith("Y"));

 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> {
   assertThat(yoda.getName()).isEqualTo("Yoda");
   assertThat(yoda.getLightSaberColor()).isEqualTo("red");
 });

 // assertions will fail

 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> assertThat(yoda.getName()).startsWith("Vad"));

 // fail as one the assertions is not satisfied
 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> {
   assertThat(yoda.getName()).isEqualTo("Yoda");
   assertThat(yoda.getLightSaberColor()).isEqualTo("purple");
 });

 // fail but only report the first error
 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> {
   assertThat(yoda.getName()).isEqualTo("Luke");
   assertThat(yoda.getLightSaberColor()).isEqualTo("green");
 });

 // fail and reports the errors thanks to Soft assertions
 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> {
   SoftAssertions softly = new SoftAssertions();
   softly.assertThat(yoda.getName()).isEqualTo("Luke");
   softly.assertThat(yoda.getLightSaberColor()).isEqualTo("green");
   softly.assertAll();
 });

 // even if the assertion is correct, there are too many jedis !
 jedis.add(new Jedi("Luke", "green"));
 assertThat(jedis).hasOnlyOneElementSatisfying(yoda -> assertThat(yoda.getName()).startsWith("Yo"));
      Specified by:
      hasOnlyOneElementSatisfying in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      elementAssertions - the assertions to perform on the unique element.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the Iterable does not have a unique element.
      AssertionError - if the Iterable's unique element does not satisfy the given assertions.
      Since:
      3.5.0

    • hasSameSizeAs

      public SELF hasSameSizeAs(Object other)
      Verifies that the actual group has the same size as given array.

      Parameter is declared as Object to accept both Object[] and primitive arrays (e.g. int[]).

      Example: 
       int[] oneTwoThree = {1, 2, 3};
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass
 assertThat(elvesRings).hasSameSizeAs(oneTwoThree);

 // assertions will fail
 assertThat(elvesRings).hasSameSizeAs(new int[] { 1, 2});
 assertThat(elvesRings).hasSameSizeAs(new int[] { 1, 2, 3, 4});
      Specified by:
      hasSameSizeAs in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the array to compare size with actual group.
      Returns:
      this assertion object.

    • hasSameSizeAs

      public SELF hasSameSizeAs(Iterable<?> other)
      Verifies that the actual group has the same size as given Iterable.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass
 assertThat(elvesRings).hasSameSizeAs(abc);

 // assertions will fail
 assertThat(elvesRings).hasSameSizeAs(Arrays.asList(1, 2));
 assertThat(elvesRings).hasSameSizeAs(Arrays.asList(1, 2, 3, 4));
      Specified by:
      hasSameSizeAs in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the Iterable to compare size with actual group.
      Returns:
      this assertion object.

    • contains

      @SafeVarargs public final SELF contains(ELEMENT... values)
      Verifies that the actual group contains the given values, in any order.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass
 assertThat(abc).contains("b", "a");
 assertThat(abc).contains("b", "a", "b");

 // assertion will fail
 assertThat(abc).contains("d");

      If you want to specify the elements to check with an Iterable, use containsAll(Iterable) instead.

      Specified by:
      contains in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • containsForProxy

      protected SELF containsForProxy(ELEMENT[] values)

    • containsOnly

      @SafeVarargs public final SELF containsOnly(ELEMENT... values)
      Verifies that the actual group contains only the given values and nothing else, in any order and ignoring duplicates (i.e. once a value is found, its duplicates are also considered found).

      If you need to check exactly the elements and their duplicates use:

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass as order does not matter
 assertThat(abc).containsOnly("c", "b", "a");
 // duplicates are ignored
 assertThat(abc).containsOnly("a", "a", "b", "c", "c");
 // ... on both actual and expected values
 assertThat(asList("a", "a", "b")).containsOnly("a", "b")
                                  .containsOnly("a", "a", "b", "b");

 // assertion will fail because "c" is missing in the given values
 assertThat(abc).containsOnly("a", "b");
 // assertion will fail because "d" is missing in abc (use isSubsetOf if you want this assertion to pass)
 assertThat(abc).containsOnly("a", "b", "c", "d");

      If you need to check that actual is a subset of the given values, use ObjectEnumerableAssert.isSubsetOf(Object...).

      If you want to specify the elements to check with an Iterable, use containsOnlyElementsOf(Iterable) instead.

      Specified by:
      containsOnly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • containsOnlyForProxy

      protected SELF containsOnlyForProxy(ELEMENT[] values)

    • containsOnlyOnce

      @SafeVarargs public final SELF containsOnlyOnce(ELEMENT... values)
      Verifies that the actual group contains the given values only once.

      Examples : 

       // lists are used in the examples but it would also work with arrays

 // assertions will pass
 assertThat(newArrayList("winter", "is", "coming")).containsOnlyOnce("winter");
 assertThat(newArrayList("winter", "is", "coming")).containsOnlyOnce("coming", "winter");

 // assertions will fail
 assertThat(newArrayList("winter", "is", "coming")).containsOnlyOnce("Lannister");
 assertThat(newArrayList("Arya", "Stark", "daughter", "of", "Ned", "Stark")).containsOnlyOnce("Stark");
 assertThat(newArrayList("Arya", "Stark", "daughter", "of", "Ned", "Stark")).containsOnlyOnce("Stark", "Lannister", "Arya");
      Specified by:
      containsOnlyOnce in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • containsOnlyOnceForProxy

      protected SELF containsOnlyOnceForProxy(ELEMENT[] values)

    • containsOnlyNulls

      public SELF containsOnlyNulls()
      Verifies that the actual group contains only null elements and nothing else.

      Example: 

       // assertion will pass
 Iterable<String> items = Arrays.asList(null, null, null);
 assertThat(items).containsOnlyNulls();

 // assertion will fail because items2 contains a not null element
 Iterable<String> items2 = Arrays.asList(null, null, "notNull");
 assertThat(items2).containsOnlyNulls();

 // assertion will fail since an empty iterable does not contain any elements and therefore no null ones.
 Iterable<String> empty = new ArrayList<>();
 assertThat(empty).containsOnlyNulls();
      Specified by:
      containsOnlyNulls in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • containsExactly

      @SafeVarargs public final SELF containsExactly(ELEMENT... values)
      Verifies that the actual group contains exactly the given values and nothing else, in order.
      This assertion should only be used with groups that have a consistent iteration order (i.e. don't use it with HashSet, prefer ObjectEnumerableAssert.containsOnly(Object...) in that case).

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass
 assertThat(elvesRings).containsExactly(vilya, nenya, narya);

 // assertion will fail as actual and expected order differ
 assertThat(elvesRings).containsExactly(nenya, vilya, narya);

      If you want to specify the elements to check with an Iterable, use containsExactlyElementsOf(Iterable) instead.

      Specified by:
      containsExactly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • containsExactlyForProxy

      protected SELF containsExactlyForProxy(ELEMENT[] values)

    • containsExactlyInAnyOrder

      @SafeVarargs public final SELF containsExactlyInAnyOrder(ELEMENT... values)
      Verifies that the actual group contains exactly the given values and nothing else, in any order.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya, vilya);

 // assertion will pass
 assertThat(elvesRings).containsExactlyInAnyOrder(vilya, vilya, nenya, narya);

 // assertion will fail as vilya is contained twice in elvesRings.
 assertThat(elvesRings).containsExactlyInAnyOrder(nenya, vilya, narya);

      If you want to specify the elements to check with an Iterable, use containsExactlyInAnyOrderElementsOf(Iterable) instead.

      Specified by:
      containsExactlyInAnyOrder in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • containsExactlyInAnyOrderForProxy

      protected SELF containsExactlyInAnyOrderForProxy(ELEMENT[] values)

    • containsExactlyInAnyOrderElementsOf

      public SELF containsExactlyInAnyOrderElementsOf(Iterable<? extends ELEMENT> values)
      Verifies that the actual group contains exactly the given values and nothing else, in any order.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya, vilya);
 Iterable<Ring> elvesRingsSomeMissing = newArrayList(vilya, nenya, narya);
 Iterable<Ring> elvesRingsDifferentOrder = newArrayList(nenya, narya, vilya, vilya);

 // assertion will pass
 assertThat(elvesRings).containsExactlyInAnyOrderElementsOf(elvesRingsDifferentOrder);

 // assertion will fail as vilya is contained twice in elvesRings.
 assertThat(elvesRings).containsExactlyInAnyOrderElementsOf(elvesRingsSomeMissing);

      If you want to directly specify the elements to check, use containsExactlyInAnyOrder(Object...) instead.

      Specified by:
      containsExactlyInAnyOrderElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • isSubsetOf

      public SELF isSubsetOf(Iterable<? extends ELEMENT> values)
      Verifies that all the elements of actual are present in the given Iterable.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 List<Ring> ringsOfPower = newArrayList(oneRing, vilya, nenya, narya, dwarfRing, manRing);
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass:
 assertThat(elvesRings).isSubsetOf(ringsOfPower);

 // assertion will fail:
 assertThat(elvesRings).isSubsetOf(newArrayList(nenya, narya));

      If you want to directly specify the set of elements, use isSubsetOf(Object...) instead.

      Specified by:
      isSubsetOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the Iterable that should contain all actual elements.
      Returns:
      this assertion object.

    • isSubsetOf

      @SafeVarargs public final SELF isSubsetOf(ELEMENT... values)
      Verifies that all the elements of actual are present in the given values.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass:
 assertThat(elvesRings).isSubsetOf(vilya, nenya, narya)
                       .isSubsetOf(vilya, nenya, narya, dwarfRing);

 // assertions will fail:
 assertThat(elvesRings).isSubsetOf(vilya, nenya);
 assertThat(elvesRings).isSubsetOf(vilya, nenya, dwarfRing);

      If you want to specify the set of elements an Iterable, use isSubsetOf(Iterable) instead.

      Specified by:
      isSubsetOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the values that should be used for checking the elements of actual.
      Returns:
      this assertion object.

    • isSubsetOfForProxy

      protected SELF isSubsetOfForProxy(ELEMENT[] values)

    • containsSequence

      @SafeVarargs public final SELF containsSequence(ELEMENT... sequence)
      Verifies that the actual group contains the given sequence in the correct order and without extra values between the sequence values.

      Use ObjectEnumerableAssert.containsSubsequence(Object...) to allow values between the expected sequence values.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).containsSequence(vilya, nenya)
                       .containsSequence(nenya, narya);

 // assertions will fail, the elements order is correct but there is a value between them (nenya)
 assertThat(elvesRings).containsSequence(vilya, narya);
 assertThat(elvesRings).containsSequence(nenya, vilya);

      If you want to specify the sequence to check with an Iterable, use containsSequence(Iterable) instead.

      Specified by:
      containsSequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • containsSequenceForProxy

      protected SELF containsSequenceForProxy(ELEMENT[] sequence)

    • containsSequence

      public SELF containsSequence(Iterable<? extends ELEMENT> sequence)
      Verifies that the actual group contains the given sequence in the correct order and without extra values between the sequence values.

      Use ObjectEnumerableAssert.containsSubsequence(Iterable) to allow values between the expected sequence values.

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).containsSequence(newArrayList(vilya, nenya))
                       .containsSequence(newArrayList(nenya, narya));

 // assertions will fail, the elements order is correct but there is a value between them (nenya)
 assertThat(elvesRings).containsSequence(newArrayList(vilya, narya));
 assertThat(elvesRings).containsSequence(newArrayList(nenya, vilya));

      If you want to directly specify the elements of the sequence to check, use containsSequence(Object...) instead.

      Specified by:
      containsSequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • doesNotContainSequence

      @SafeVarargs public final SELF doesNotContainSequence(ELEMENT... sequence)
      Verifies that the actual group does not contain the given sequence, a sequence is defined by an ordered group of values without extra values between them.

      Use ObjectEnumerableAssert.doesNotContainSubsequence(Object...) to also ensure the sequence does not exist with values between the expected sequence values.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass, the elements order is correct but there is a value between them (nenya)
 assertThat(elvesRings).doesNotContainSequence(vilya, narya)
                       .doesNotContainSequence(nenya, vilya);

 // assertions will fail
 assertThat(elvesRings).doesNotContainSequence(vilya, nenya);
 assertThat(elvesRings).doesNotContainSequence(nenya, narya);

      If you want to specify the sequence not to find with an Iterable, use doesNotContainSequence(Iterable) instead.

      Specified by:
      doesNotContainSequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • doesNotContainSequenceForProxy

      protected SELF doesNotContainSequenceForProxy(ELEMENT[] sequence)

    • doesNotContainSequence

      public SELF doesNotContainSequence(Iterable<? extends ELEMENT> sequence)
      Verifies that the actual group does not contain the given sequence, a sequence is defined by an ordered group of values without extra values between them.

      Use ObjectEnumerableAssert.doesNotContainSubsequence(Iterable) to also ensure the sequence does not exist with values between the sequence values.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass, the elements order is correct but there is a value between them (nenya)
 assertThat(elvesRings).doesNotContainSequence(newArrayList(vilya, narya))
                       .doesNotContainSequence(newArrayList(nenya, vilya));

 // assertions will fail
 assertThat(elvesRings).doesNotContainSequence(newArrayList(vilya, nenya));
 assertThat(elvesRings).doesNotContainSequence(newArrayList(nenya, narya));

      If you want to directly specify the elements of the sequence not to find, use doesNotContainSequence(Object...) instead.

      Specified by:
      doesNotContainSequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • containsSubsequence

      @SafeVarargs public final SELF containsSubsequence(ELEMENT... subsequence)
      Verifies that the actual group contains the given subsequence in the correct order (possibly with other values between them).

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).containsSubsequence(vilya, nenya)
                       .containsSubsequence(vilya, narya);

 // assertion will fail
 assertThat(elvesRings).containsSubsequence(nenya, vilya);

      If you want to specify the elements of the subsequence to check with an Iterable, use containsSubsequence(Iterable) instead.

      Specified by:
      containsSubsequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      subsequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • containsSubsequenceForProxy

      protected SELF containsSubsequenceForProxy(ELEMENT[] subsequence)

    • containsSubsequence

      public SELF containsSubsequence(Iterable<? extends ELEMENT> subsequence)
      Verifies that the actual group contains the given subsequence in the correct order (possibly with other values between them).

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).containsSubsequence(newArrayList(vilya, nenya))
                       .containsSubsequence(newArrayList(vilya, narya));

 // assertion will fail
 assertThat(elvesRings).containsSubsequence(newArrayList(nenya, vilya));

      If you want to directly specify the subsequence to check, use containsSubsequence(Object...) instead.

      Specified by:
      containsSubsequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      subsequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • doesNotContainSubsequence

      @SafeVarargs public final SELF doesNotContainSubsequence(ELEMENT... subsequence)
      Verifies that the actual group does not contain the given subsequence, a subsequence is defined by an ordered group of values with possibly extra values between them.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).doesNotContainSubsequence(nenya, vilya)
                       .doesNotContainSubsequence(narya, vilya);

 // assertion will fail
 assertThat(elvesRings).doesNotContainSubsequence(vilya, nenya);
 assertThat(elvesRings).doesNotContainSubsequence(vilya, narya);

      If you want to specify the subsequence not to find with an Iterable, use doesNotContainSubsequence(Iterable) instead.

      Specified by:
      doesNotContainSubsequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      subsequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • doesNotContainSubsequenceForProxy

      protected SELF doesNotContainSubsequenceForProxy(ELEMENT[] subsequence)

    • doesNotContainSubsequence

      public SELF doesNotContainSubsequence(Iterable<? extends ELEMENT> subsequence)
      Verifies that the actual group does not contain the given subsequence, a subsequence is defined by an ordered group of values with possibly extra values between them.

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass
 assertThat(elvesRings).doesNotContainSubsequence(newArrayList(nenya, vilya));
                       .doesNotContainSubsequence(newArrayList(narya, vilya));

 // assertion will fail
 assertThat(elvesRings).doesNotContainSubsequence(newArrayList(vilya, nenya));
 assertThat(elvesRings).doesNotContainSubsequence(newArrayList(vilya, narya));

      If you want to directly specify the elements of the subsequence not to find, use doesNotContainSubsequence(Object...) instead.

      Specified by:
      doesNotContainSubsequence in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      subsequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • doesNotContain

      @SafeVarargs public final SELF doesNotContain(ELEMENT... values)
      Description copied from interface: ObjectEnumerableAssert
      Verifies that the actual group does not contain the given values.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass
 assertThat(abc).doesNotContain("d")
                .doesNotContain("d", "e");

 // assertions will fail
 assertThat(abc).doesNotContain("a");
 assertThat(abc).doesNotContain("a", "b");
 assertThat(abc).doesNotContain("c", "d");

      If you want to specify the elements not to find with an Iterable, use doesNotContainAnyElementsOf(Iterable) instead.

      Specified by:
      doesNotContain in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given values.
      Returns:
      this assertion object.

    • doesNotContainForProxy

      protected SELF doesNotContainForProxy(ELEMENT[] values)

    • doesNotContainAnyElementsOf

      public SELF doesNotContainAnyElementsOf(Iterable<? extends ELEMENT> iterable)
      Description copied from interface: ObjectEnumerableAssert
      Verifies that actual does not contain any elements of the given Iterable (i.e. none).

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");

 // assertion succeeds:
 assertThat(actual).doesNotContainAnyElementsOf(newArrayList("d", "e"));

 // assertion fails:
 assertThat(actual).doesNotContainAnyElementsOf(newArrayList("d", "e", "a"));

      If you want to directly specify the elements not to find, use doesNotContain(Object...) instead.

      Specified by:
      doesNotContainAnyElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the Iterable whose elements must not be in the actual group.
      Returns:
      this assertion object.

    • doesNotHaveDuplicates

      public SELF doesNotHaveDuplicates()
      Verifies that the actual group does not contain duplicates.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> lotsOfAs = newArrayList("a", "a", "a");

 // assertion will pass
 assertThat(abc).doesNotHaveDuplicates();

 // assertion will fail
 assertThat(lotsOfAs).doesNotHaveDuplicates();
      Specified by:
      doesNotHaveDuplicates in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • startsWith

      @SafeVarargs public final SELF startsWith(ELEMENT... sequence)
      Verifies that the actual group starts with the given sequence of objects, without any other objects between them. Similar to ObjectEnumerableAssert.containsSequence(Object...), but it also verifies that the first element in the sequence is also first element of the actual group.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass
 assertThat(abc).startsWith("a")
                .startsWith("a", "b");

 // assertion will fail
 assertThat(abc).startsWith("c");
      Specified by:
      startsWith in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • startsWithForProxy

      protected SELF startsWithForProxy(ELEMENT[] sequence)

    • endsWith

      @SafeVarargs public final SELF endsWith(ELEMENT first, ELEMENT... rest)
      Verifies that the actual group ends with the given sequence of objects, without any other objects between them. Similar to ObjectEnumerableAssert.containsSequence(Object...), but it also verifies that the last element in the sequence is also last element of the actual group.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass
 assertThat(abc).endsWith("c")
                .endsWith("b", "c");

 // assertions will fail
 assertThat(abc).endsWith("a");
 assertThat(abc).endsWith("a", "b");
      Specified by:
      endsWith in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      first - the first element of the sequence of objects to look for.
      rest - the rest of the sequence of objects to look for.
      Returns:
      this assertion object.

    • endsWithForProxy

      protected SELF endsWithForProxy(ELEMENT first, ELEMENT[] rest)

    • endsWith

      public SELF endsWith(ELEMENT[] sequence)
      Verifies that the actual group ends with the given sequence of objects, without any other objects between them. Similar to ObjectEnumerableAssert.containsSequence(Object...), but it also verifies that the last element in the sequence is also last element of the actual group.

      Example: 

       // an Iterable is used in the example but it would also work with an array
 Iterable<String> abc = newArrayList("a", "b", "c");

 // assertions will pass
 assertThat(abc).endsWith(new String[0])
                .endsWith(new String[] {"c"})
                .endsWith(new String[] {"b", "c"});

 // assertions will fail
 assertThat(abc).endsWith(new String[] {"a"});
 assertThat(abc).endsWith(new String[] {"a", "b"});
      Specified by:
      endsWith in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      sequence - the sequence of objects to look for.
      Returns:
      this assertion object.

    • containsNull

      public SELF containsNull()
      Verifies that the actual group contains at least a null element.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abNull = newArrayList("a", "b", null);

 // assertion will pass
 assertThat(abNull).containsNull();

 // assertion will fail
 assertThat(abc).containsNull();
      Specified by:
      containsNull in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • doesNotContainNull

      public SELF doesNotContainNull()
      Verifies that the actual group does not contain null elements.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abNull = newArrayList("a", "b", null);

 // assertion will pass
 assertThat(abc).doesNotContainNull();

 // assertion will fail
 assertThat(abNull).doesNotContainNull();
      Specified by:
      doesNotContainNull in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • are

      public SELF are(Condition<? super ELEMENT> condition)
      Verifies that each element value satisfies the given condition.

      Example: 

       Iterable<String> abc  = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 Condition<String> singleCharacterString
      = new Condition<>(s -> s.length() == 1, "single character String");

 // assertion will pass
 assertThat(abc).are(singleCharacterString);

 // assertion will fail
 assertThat(abcc).are(singleCharacterString);
      Specified by:
      are in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this object.

    • areNot

      public SELF areNot(Condition<? super ELEMENT> condition)
      Verifies that each element value does not satisfy the given condition.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 Condition<String> moreThanOneCharacter =
     = new Condition<>(s -> s.length() > 1, "more than one character");

 // assertion will pass
 assertThat(abc).areNot(moreThanOneCharacter);

 // assertion will fail
 assertThat(abcc).areNot(moreThanOneCharacter);
      Specified by:
      areNot in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this object.

    • have

      public SELF have(Condition<? super ELEMENT> condition)
      Verifies that all elements satisfy the given condition.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 Condition<String> onlyOneCharacter =
     = new Condition<>(s -> s.length() == 1, "only one character");

 // assertion will pass
 assertThat(abc).have(onlyOneCharacter);

 // assertion will fail
 assertThat(abcc).have(onlyOneCharacter);
      Specified by:
      have in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this object.

    • doNotHave

      public SELF doNotHave(Condition<? super ELEMENT> condition)
      Verifies that all elements do not satisfy the given condition.

      Example: 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 Condition<String> moreThanOneCharacter =
     = new Condition<>(s -> s.length() > 1, "more than one character");

 // assertion will pass
 assertThat(abc).doNotHave(moreThanOneCharacter);

 // assertion will fail
 assertThat(abcc).doNotHave(moreThanOneCharacter);
      Specified by:
      doNotHave in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this object.

    • areAtLeastOne

      public SELF areAtLeastOne(Condition<? super ELEMENT> condition)
      Verifies that there is at least one element in the actual group satisfying the given condition.

      This method is an alias for areAtLeast(1, condition).

      Example: 

       // jedi is a Condition<String>
 assertThat(newLinkedHashSet("Luke", "Solo", "Leia")).areAtLeastOne(jedi);
      Specified by:
      areAtLeastOne in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this assertion object.
      See Also:

    • areAtLeast

      public SELF areAtLeast(int times, Condition<? super ELEMENT> condition)
      Verifies that there are at least n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertion will pass
 oneTwoThree.areAtLeast(2, oddNumber);

 // assertion will fail
 oneTwoThree.areAtLeast(3, oddNumber);
      Specified by:
      areAtLeast in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the minimum number of times the condition should be verified.
      condition - the given condition.
      Returns:
      this object.

    • areAtMost

      public SELF areAtMost(int times, Condition<? super ELEMENT> condition)
      Verifies that there are at most n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertions will pass
 oneTwoThree.areAtMost(2, oddNumber)
            .areAtMost(3, oddNumber);

 // assertion will fail
 oneTwoThree.areAtMost(1, oddNumber);
      Specified by:
      areAtMost in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the number of times the condition should be at most verified.
      condition - the given condition.
      Returns:
      this object.

    • areExactly

      public SELF areExactly(int times, Condition<? super ELEMENT> condition)
      Verifies that there are exactly n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertion will pass
 oneTwoThree.areExactly(2, oddNumber);

 // assertions will fail
 oneTwoThree.areExactly(1, oddNumber);
 oneTwoThree.areExactly(3, oddNumber);
      Specified by:
      areExactly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the exact number of times the condition should be verified.
      condition - the given condition.
      Returns:
      this object.

    • haveAtLeastOne

      public SELF haveAtLeastOne(Condition<? super ELEMENT> condition)
      Verifies that there is at least one element in the actual group satisfying the given condition.

      This method is an alias for haveAtLeast(1, condition).

      Example: 

       Iterable<BasketBallPlayer> bullsPlayers = newArrayList(butler, rose);

 // potentialMvp is a Condition<BasketBallPlayer>
 assertThat(bullsPlayers).haveAtLeastOne(potentialMvp);
      Specified by:
      haveAtLeastOne in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this assertion object.
      See Also:

    • haveAtLeast

      public SELF haveAtLeast(int times, Condition<? super ELEMENT> condition)
      Verifies that there are at least n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertion will pass
 oneTwoThree.haveAtLeast(2, oddNumber);

 // assertion will fail
 oneTwoThree.haveAtLeast(3, oddNumber);
      This method is an alias for ObjectEnumerableAssert.areAtLeast(int, Condition).
      Specified by:
      haveAtLeast in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the minimum number of times the condition must hold.
      condition - the given condition.
      Returns:
      this assertion object.

    • haveAtMost

      public SELF haveAtMost(int times, Condition<? super ELEMENT> condition)
      Verifies that there are at most n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertions will pass
 oneTwoThree.haveAtMost(2, oddNumber);
 oneTwoThree.haveAtMost(3, oddNumber);

 // assertion will fail
 oneTwoThree.haveAtMost(1, oddNumber);
      This method is an alias ObjectEnumerableAssert.areAtMost(int, Condition).
      Specified by:
      haveAtMost in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the maximum number of times the condition must hold.
      condition - the given condition.
      Returns:
      this assertion object.

    • haveExactly

      public SELF haveExactly(int times, Condition<? super ELEMENT> condition)
      Verifies that there are exactly n elements in the actual group satisfying the given condition.

      Example: 

       Iterable<Integer> oneTwoThree = newArrayList(1, 2, 3);

 Condition<Integer> oddNumber = new Condition<>(value % 2 == 1, "odd number");

 // assertion will pass
 oneTwoThree.haveExactly(2, oddNumber);

 // assertions will fail
 oneTwoThree.haveExactly(1, oddNumber);
 oneTwoThree.haveExactly(3, oddNumber);
      This method is an alias ObjectEnumerableAssert.areExactly(int, Condition).
      Specified by:
      haveExactly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      times - the exact number of times the condition must hold.
      condition - the given condition.
      Returns:
      this assertion object.

    • hasAtLeastOneElementOfType

      public SELF hasAtLeastOneElementOfType(Class<?> expectedType)
      Verifies that at least one element in the actual Iterable has the specified type (matching includes subclasses of the given type).

      Example: 

       List<Number> numbers = new ArrayList<Number>();
 numbers.add(1);
 numbers.add(2L);

 // successful assertion:
 assertThat(numbers).hasAtLeastOneElementOfType(Long.class);

 // assertion failure:
 assertThat(numbers).hasAtLeastOneElementOfType(Float.class);
      Specified by:
      hasAtLeastOneElementOfType in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expectedType - the expected type.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the given type is null.
      AssertionError - if the actual Object group does not have any elements of the given type.

    • hasOnlyElementsOfType

      public SELF hasOnlyElementsOfType(Class<?> expectedType)
      Verifies that all elements in the actual Iterable have the specified type (matching includes subclasses of the given type).

      Example: 

       List<Number> numbers = new ArrayList<Number>();
 numbers.add(1);
 numbers.add(2);
 numbers.add(3);

 // successful assertions:
 assertThat(numbers).hasOnlyElementsOfType(Number.class);
 assertThat(numbers).hasOnlyElementsOfType(Integer.class);

 // assertion failure:
 assertThat(numbers).hasOnlyElementsOfType(Long.class);
      Specified by:
      hasOnlyElementsOfType in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expectedType - the expected type.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the given type is null.
      AssertionError - if one element is not of the expected type.

    • doesNotHaveAnyElementsOfTypes

      public SELF doesNotHaveAnyElementsOfTypes(Class<?>... unexpectedTypes)
      Verifies that all elements in the actual Iterable do not have the specified types (including subclasses).

      Example: 

       List<Number> numbers = new ArrayList<>();
 numbers.add(1);
 numbers.add(2);
 numbers.add(3.0);

 // successful assertions:
 assertThat(numbers).doesNotHaveAnyElementsOfTypes(Long.class, Float.class);

 // assertion failure:
 assertThat(numbers).doesNotHaveAnyElementsOfTypes(Long.class, Integer.class);
      Specified by:
      doesNotHaveAnyElementsOfTypes in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      unexpectedTypes - the not expected types.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the given type is null.
      AssertionError - if one element's type matches the given types.
      Since:
      2.9.0 / 3.9.0

    • hasOnlyElementsOfTypes

      public SELF hasOnlyElementsOfTypes(Class<?>... types)
      Verifies that all elements of the actual group are instances of the given types.

      Example: 

       Iterable<? extends Object> objects = Arrays.asList("foo", new StringBuilder());

 // assertions will pass
 assertThat(objects).hasOnlyElementsOfTypes(CharSequence.class)
                    .hasOnlyElementsOfTypes(String.class, StringBuilder.class);

 // assertions will fail
 assertThat(objects).hasOnlyElementsOfTypes(Number.class);
 assertThat(objects).hasOnlyElementsOfTypes(String.class, Number.class);
 assertThat(objects).hasOnlyElementsOfTypes(String.class);
      Specified by:
      hasOnlyElementsOfTypes in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the expected types
      Returns:
      this assertion object.

    • hasExactlyElementsOfTypes

      public SELF hasExactlyElementsOfTypes(Class<?>... types)
      Verifies that the actual elements are of the given types in the given order, there should be as many expected types as there are actual elements.

      Example: 

       Iterable<Object> list = Arrays.asList(1, "a", "b", 1.00);

 // assertion succeeds
 assertThat(list).hasExactlyElementsOfTypes(Integer.class, String.class, String.class, Double.class);

 // assertions fail
 // missing second String type
 assertThat(list).hasExactlyElementsOfTypes(Integer.class, String.class, Double.class);
 // no Float type in actual
 assertThat(list).hasExactlyElementsOfTypes(Float.class, String.class, String.class, Double.class);
 // correct types but wrong order
 assertThat(list).hasExactlyElementsOfTypes(String.class, Integer.class, String.class, Double.class);
 // actual has more elements than the specified expected types
 assertThat(list).hasExactlyElementsOfTypes(String.class);
      Specified by:
      hasExactlyElementsOfTypes in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the expected types
      Returns:
      this assertion object.

    • containsAll

      public SELF containsAll(Iterable<? extends ELEMENT> iterable)
      Verifies that the actual group contains all the elements of given Iterable, in any order.

      Example: 

       Iterable<String> abc = Arrays.asList("a", "b", "c");

 // assertions will pass
 assertThat(abc).containsAll(Arrays.asList("b", "c"))
                .containsAll(Arrays.asList("a", "b", "c"));

 // assertions will fail
 assertThat(abc).containsAll(Arrays.asList("d"));
 assertThat(abc).containsAll(Arrays.asList("a", "b", "c", "d"));

      If you want to directly specify the elements to check, use contains(Object...) instead.

      Specified by:
      containsAll in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the given Iterable we will get elements from.
      Returns:
      this assertion object.

    • usingElementComparator

      public SELF usingElementComparator(Comparator<? super ELEMENT> elementComparator)
      Use given custom comparator instead of relying on actual type A equals method to compare group elements for incoming assertion checks.

      Custom comparator is bound to assertion instance, meaning that if a new assertion is created, it will use default comparison strategy.

      Examples : 
       // compares invoices by payee
 assertThat(invoiceList).usingComparator(invoicePayeeComparator).isEqualTo(expectedInvoiceList);

 // compares invoices by date, doesNotHaveDuplicates and contains both use the given invoice date comparator
 assertThat(invoiceList).usingComparator(invoiceDateComparator).doesNotHaveDuplicates().contains(may2010Invoice);

 // as assertThat(invoiceList) creates a new assertion, it falls back to standard comparison strategy
 // based on Invoice's equal method to compare invoiceList elements to lowestInvoice.
 assertThat(invoiceList).contains(lowestInvoice);

 // standard comparison : the fellowshipOfTheRing includes Gandalf but not Sauron (believe me) ...
 assertThat(fellowshipOfTheRing).contains(gandalf)
                                .doesNotContain(sauron);

 // ... but if we compare only races, Sauron is in fellowshipOfTheRing because he's a Maia like Gandalf.
 assertThat(fellowshipOfTheRing).usingElementComparator(raceComparator)
                                .contains(sauron);
      Specified by:
      usingElementComparator in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      elementComparator - the comparator to use for incoming assertion checks.
      Returns:
      this assertion object.

    • usingDefaultElementComparator

      public SELF usingDefaultElementComparator()
      Revert to standard comparison for incoming assertion group element checks.

      This method should be used to disable a custom comparison strategy set by calling EnumerableAssert.usingElementComparator(Comparator).

      Specified by:
      usingDefaultElementComparator in interface EnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • containsAnyOf

      @SafeVarargs public final SELF containsAnyOf(ELEMENT... values)
      Verifies that the actual Iterable contains at least one of the given values.

      Example: 

       Iterable<String> abc = Arrays.asList("a", "b", "c");

 // assertions will pass
 assertThat(abc).containsAnyOf("b")
                .containsAnyOf("b", "c")
                .containsAnyOf("a", "b", "c")
                .containsAnyOf("a", "b", "c", "d")
                .containsAnyOf("e", "f", "g", "b");

 // assertions will fail
 assertThat(abc).containsAnyOf("d");
 assertThat(abc).containsAnyOf("d", "e", "f", "g");
      Specified by:
      containsAnyOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the values whose at least one which is expected to be in the Iterable under test.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty and the Iterable under test is not empty.
      AssertionError - if the Iterable under test is null.
      AssertionError - if the Iterable under test does not contain any of the given values.
      Since:
      2.9.0 / 3.9.0

    • containsAnyOfForProxy

      protected SELF containsAnyOfForProxy(ELEMENT[] values)

    • containsAnyElementsOf

      public SELF containsAnyElementsOf(Iterable<? extends ELEMENT> iterable)
      Verifies that the Iterable under test contains at least one of the given Iterable elements.

      Example: 

       Iterable<String> abc = Arrays.asList("a", "b", "c");

 // assertions will pass
 assertThat(abc).containsAnyElementsOf(Arrays.asList("b"))
                .containsAnyElementsOf(Arrays.asList("b", "c"))
                .containsAnyElementsOf(Arrays.asList("a", "b", "c"))
                .containsAnyElementsOf(Arrays.asList("a", "b", "c", "d"))
                .containsAnyElementsOf(Arrays.asList("e", "f", "g", "b"));

 // assertions will fail
 assertThat(abc).containsAnyElementsOf(Arrays.asList("d"));
 assertThat(abc).containsAnyElementsOf(Arrays.asList("d", "e", "f", "g"));
      Specified by:
      containsAnyElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the iterable whose at least one element is expected to be in the Iterable under test.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the iterable of expected values is null.
      IllegalArgumentException - if the iterable of expected values is empty and the Iterable under test is not empty.
      AssertionError - if the Iterable under test is null.
      AssertionError - if the Iterable under test does not contain any of elements from the given Iterable.
      Since:
      2.9.0 / 3.9.0

    • extracting

      public AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> extracting(String propertyOrField)
      Extract the values of the given field or property from the Iterable's elements under test into a new Iterable, this new Iterable becoming the Iterable under test.

      It allows you to test a property/field of the Iterable's elements instead of testing the elements themselves, which can be be much less work!

      Let's take a look at an example to make things clearer: 

       // build a list of TolkienCharacters: a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // let's verify the names of the TolkienCharacters in fellowshipOfTheRing:

 assertThat(fellowshipOfTheRing).extracting("name")
           .contains("Boromir", "Gandalf", "Frodo")
           .doesNotContain("Sauron", "Elrond");

 // you can extract nested properties/fields like the name of the race:

 assertThat(fellowshipOfTheRing).extracting("race.name")
                                .contains("Hobbit", "Elf")
                                .doesNotContain("Orc");

      A property with the given name is searched for first. If it doesn't exist a field with the given name is looked for. If the field does not exist an IntrospectionError is thrown. By default private fields are read but you can change this with Assertions.setAllowComparingPrivateFields(boolean). Trying to read a private field when it's not allowed leads to an IntrospectionError.

      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.

      Extracting also support maps, that is, instead of extracting values from an Object, it extracts maps values corresponding to the given keys.

      Example: 

       Employee yoda = new Employee(1L, new Name("Yoda"), 800);
 Employee luke = new Employee(2L, new Name("Luke"), 22);
 Employee han = new Employee(3L, new Name("Han"), 31);

 // build two maps
 Map<String, Employee> map1 = new HashMap<>();
 map1.put("key1", yoda);
 map1.put("key2", luke);

 Map<String, Employee> map2 = new HashMap<>();
 map2.put("key1", yoda);
 map2.put("key2", han);

 // instead of a list of objects, we have a list of maps
 List<Map<String, Employee>> maps = asList(map1, map2);

 // extracting a property in that case = get values from maps using the property as a key
 assertThat(maps).extracting("key2").containsExactly(luke, han);
 assertThat(maps).extracting("key1").containsExactly(yoda, yoda);

 // type safe version
 assertThat(maps).extracting(key2, Employee.class).containsExactly(luke, han);

 // it works with several keys, extracted values being wrapped in a Tuple
 assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));

 // unknown keys leads to null (map behavior)
 assertThat(maps).extracting("bad key").containsExactly(null, null);
      Parameters:
      propertyOrField - the property/field to extract from the elements of the Iterable under test
      Returns:
      a new assertion object whose object under test is the list of extracted property/field values.
      Throws:
      IntrospectionError - if no field or property exists with the given name in one of the initial Iterable's element.

    • extractingResultOf

      public AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> extractingResultOf(String method)
      Extract the result of given method invocation on the Iterable's elements under test into a new Iterable, this new Iterable becoming the Iterable under test.

      It allows you to test the method results of the Iterable's elements instead of testing the elements themselves. This is especially useful for classes that do not conform to the Java Bean's getter specification (i.e. public String toString() or public String status() instead of public String getStatus()).

      Let's take a look at an example to make things clearer: 

       // Build an array of WesterosHouse, a WesterosHouse has a method: public String sayTheWords()

 List<WesterosHouse> greatHouses = new ArrayList<WesterosHouse>();
 greatHouses.add(new WesterosHouse("Stark", "Winter is Coming"));
 greatHouses.add(new WesterosHouse("Lannister", "Hear Me Roar!"));
 greatHouses.add(new WesterosHouse("Greyjoy", "We Do Not Sow"));
 greatHouses.add(new WesterosHouse("Baratheon", "Our is the Fury"));
 greatHouses.add(new WesterosHouse("Martell", "Unbowed, Unbent, Unbroken"));
 greatHouses.add(new WesterosHouse("Tyrell", "Growing Strong"));

 // let's verify the words of the great houses of Westeros:
 assertThat(greatHouses).extractingResultOf("sayTheWords")
                        .contains("Winter is Coming", "We Do Not Sow", "Hear Me Roar")
                        .doesNotContain("Lannisters always pay their debts");
      Following requirements have to be met to extract method results:
      • method has to be public,
      • method cannot accept any arguments,
      • method cannot return void.

      Note that the order of extracted results is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted results order.

      Parameters:
      method - the name of the method which result is to be extracted from the array under test
      Returns:
      a new assertion object whose object under test is the Iterable of extracted values.
      Throws:
      IllegalArgumentException - if no method exists with the given name, or method is not public, or method does return void, or method accepts arguments.

    • extractingResultOf

      public <P> AbstractListAssert<?,List<? extends P>,P,ObjectAssert<P>> extractingResultOf(String method, Class<P> extractedType)
      Extract the result of given method invocation on the Iterable's elements under test into a new list of the given class, this new List becoming the object under test.

      It allows you to test the method results of the Iterable's elements instead of testing the elements themselves, it is especially useful for classes that do not conform to the Java Bean's getter specification (i.e. public String toString() or public String status() instead of public String getStatus()).

      Let's take an example to make things clearer: 

       // Build an array of WesterosHouse, a WesterosHouse has a method: public String sayTheWords()
 List<WesterosHouse> greatHouses = new ArrayList<WesterosHouse>();
 greatHouses.add(new WesterosHouse("Stark", "Winter is Coming"));
 greatHouses.add(new WesterosHouse("Lannister", "Hear Me Roar!"));
 greatHouses.add(new WesterosHouse("Greyjoy", "We Do Not Sow"));
 greatHouses.add(new WesterosHouse("Baratheon", "Our is the Fury"));
 greatHouses.add(new WesterosHouse("Martell", "Unbowed, Unbent, Unbroken"));
 greatHouses.add(new WesterosHouse("Tyrell", "Growing Strong"));

 // let's verify the words of the great houses of Westeros:
 assertThat(greatHouses).extractingResultOf("sayTheWords", String.class)
                        .contains("Winter is Coming", "We Do Not Sow", "Hear Me Roar")
                        .doesNotContain("Lannisters always pay their debts");
      Following requirements have to be met to extract method results:
      • method has to be public,
      • method cannot accept any arguments,
      • method cannot return void.

      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions of the extracted values order.

      Type Parameters:
      P - the type of elements extracted.
      Parameters:
      method - the name of the method which result is to be extracted from the array under test
      extractedType - type of element of the extracted List
      Returns:
      a new assertion object whose object under test is the Iterable of extracted values.
      Throws:
      IllegalArgumentException - if no method exists with the given name, or method is not public, or method does return void or method accepts arguments.

    • extracting

      public <P> AbstractListAssert<?,List<? extends P>,P,ObjectAssert<P>> extracting(String propertyOrField, Class<P> extractingType)
      Extract the values of given field or property from the Iterable's elements under test into a new Iterable, this new Iterable becoming the Iterable under test.

      It allows you to test a property/field of the Iterable's elements instead of testing the elements themselves, which can be much less work!

      Let's take an example to make things clearer: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // let's verify the names of TolkienCharacter in fellowshipOfTheRing:
 assertThat(fellowshipOfTheRing).extracting("name", String.class)
           .contains("Boromir", "Gandalf", "Frodo")
           .doesNotContain("Sauron", "Elrond");

 // you can extract nested property/field like the name of Race:
 assertThat(fellowshipOfTheRing).extracting("race.name", String.class)
                                .contains("Hobbit", "Elf")
                                .doesNotContain("Orc");
      A property with the given name is looked for first, if it doesn't exist then a field with the given name is looked for, if the field does not exist an IntrospectionError is thrown, by default private fields are read but you can change this with Assertions.setAllowComparingPrivateFields(boolean), trying to read a private field when it's not allowed leads to an IntrospectionError.

      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.

      Extracting also support maps, that is, instead of extracting values from an Object, it extract maps values corresponding to the given keys.

      Example: 

       Employee yoda = new Employee(1L, new Name("Yoda"), 800);
 Employee luke = new Employee(2L, new Name("Luke"), 22);
 Employee han = new Employee(3L, new Name("Han"), 31);

 // build two maps
 Map<String, Employee> map1 = new HashMap<>();
 map1.put("key1", yoda);
 map1.put("key2", luke);

 Map<String, Employee> map2 = new HashMap<>();
 map2.put("key1", yoda);
 map2.put("key2", han);

 // instead of a list of objects, we have a list of maps
 List<Map<String, Employee>> maps = asList(map1, map2);

 // extracting a property in that case = get values from maps using property as a key
 assertThat(maps).extracting(key2, Employee.class).containsExactly(luke, han);

 // non type safe version
 assertThat(maps).extracting("key2").containsExactly(luke, han);
 assertThat(maps).extracting("key1").containsExactly(yoda, yoda);

 // it works with several keys, extracted values being wrapped in a Tuple
 assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));

 // unknown keys leads to null (map behavior)
 assertThat(maps).extracting("bad key").containsExactly(null, null);
      Type Parameters:
      P - the type of elements extracted.
      Parameters:
      propertyOrField - the property/field to extract from the Iterable under test
      extractingType - type to return
      Returns:
      a new assertion object whose object under test is the list of extracted property/field values.
      Throws:
      IntrospectionError - if no field or property exists with the given name in one of the initial Iterable's element.

    • extracting

      public AbstractListAssert<?,List<? extends Tuple>,Tuple,ObjectAssert<Tuple>> extracting(String... propertiesOrFields)
      Extract the values of the given fields/properties from the Iterable's elements under test into a new Iterable composed of Tuples (a simple data structure), this new Iterable becoming the Iterable under test.

      It allows you to test fields/properties of the Iterable's elements instead of testing the elements themselves, which can be much less work!

      The Tuple data corresponds to the extracted values of the given fields/properties, for instance if you ask to extract "id", "name" and "email" then each Tuple data will be composed of id, name and email extracted from the element of the initial Iterable (the Tuple's data order is the same as the given fields/properties order).

      Let's take an example to make things clearer: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // let's verify 'name' and 'age' of some TolkienCharacter in fellowshipOfTheRing:
 assertThat(fellowshipOfTheRing).extracting("name", "age")
                                .contains(tuple("Boromir", 37),
                                          tuple("Sam", 38),
                                          tuple("Legolas", 1000));


 // extract 'name', 'age' and Race name values:
 assertThat(fellowshipOfTheRing).extracting("name", "age", "race.name")
                                .contains(tuple("Boromir", 37, "Man"),
                                          tuple("Sam", 38, "Hobbit"),
                                          tuple("Legolas", 1000, "Elf"));
      A property with the given name is looked for first, if it doesn't exist then a field with the given name is looked for, if the field does not exist an IntrospectionError is thrown, by default private fields are read but you can change this with Assertions.setAllowComparingPrivateFields(boolean), trying to read a private field when it's not allowed leads to an IntrospectionError.

      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.

      Extracting also support maps, that is, instead of extracting values from an Object, it extract maps values corresponding to the given keys.

      Example: 

       Employee yoda = new Employee(1L, new Name("Yoda"), 800);
 Employee luke = new Employee(2L, new Name("Luke"), 22);
 Employee han = new Employee(3L, new Name("Han"), 31);

 // build two maps
 Map<String, Employee> map1 = new HashMap<>();
 map1.put("key1", yoda);
 map1.put("key2", luke);

 Map<String, Employee> map2 = new HashMap<>();
 map2.put("key1", yoda);
 map2.put("key2", han);

 // instead of a list of objects, we have a list of maps
 List<Map<String, Employee>> maps = asList(map1, map2);

 // extracting a property in that case = get values from maps using property as a key
 assertThat(maps).extracting("key2").containsExactly(luke, han);
 assertThat(maps).extracting("key1").containsExactly(yoda, yoda);

 // it works with several keys, extracted values being wrapped in a Tuple
 assertThat(maps).extracting("key1", "key2").containsExactly(tuple(yoda, luke), tuple(yoda, han));

 // unknown keys leads to null (map behavior)
 assertThat(maps).extracting("bad key").containsExactly(null, null);
      Parameters:
      propertiesOrFields - the properties/fields to extract from the elements of the Iterable under test
      Returns:
      a new assertion object whose object under test is the list of Tuple with extracted properties/fields values as data.
      Throws:
      IntrospectionError - if one of the given name does not match a field or property in one of the initial Iterable's element.

    • extracting

      public <V> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> extracting(Function<? super ELEMENT,V> extractor)
      Extract the values from Iterable's elements under test by applying an extracting function on them. The returned iterable becomes the instance under test.

      It allows to test values from the elements more safely than by using extracting(String), as it doesn't utilize introspection.

      Let's have a look at an example: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // fellowship has hobbitses, right, my presioussss?
 assertThat(fellowshipOfTheRing).extracting(TolkienCharacter::getRace).contains(HOBBIT);
      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.
      Type Parameters:
      V - the type of elements extracted.
      Parameters:
      extractor - the object transforming input object to desired one
      Returns:
      a new assertion object whose object under test is the list of values extracted

    • map

      public <V> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> map(Function<? super ELEMENT,V> mapper)
      Maps the Iterable's elements under test by applying a mapping function, the resulting list becomes the instance under test.

      This allows to test values from the elements more safely than by using extracting(String).

      Let's have a look at an example: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // fellowship has hobbitses, right, my precioussss?
 assertThat(fellowshipOfTheRing).map(TolkienCharacter::getRace)
                                .contains(HOBBIT);
      Note that the order of mapped values is consistent with the order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.
      Type Parameters:
      V - the type of elements resulting of the map operation.
      Parameters:
      mapper - the Function transforming input object to desired one
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.19.0

    • extracting

      public <V, EXCEPTION extends Exception> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> extracting(ThrowingExtractor<? super ELEMENT,V,EXCEPTION> extractor)
      Extract the values from Iterable's elements under test by applying an extracting function (which might throw an exception) on them. The returned iterable becomes the instance under test.

      Any checked exception raised in the extractor is rethrown wrapped in a RuntimeException.

      It allows to test values from the elements more safely than by using extracting(String), as it doesn't utilize introspection.

      Let's have a look at an example: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 assertThat(fellowshipOfTheRing).extracting(input -> {
   if (input.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input.getName();
 }).contains("Frodo");
      Note that the order of extracted property/field values is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.
      Type Parameters:
      EXCEPTION - the exception type of ThrowingExtractor
      V - the type of elements extracted.
      Parameters:
      extractor - the object transforming input object to desired one
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.7.0

    • map

      public <V, EXCEPTION extends Exception> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> map(ThrowingExtractor<? super ELEMENT,V,EXCEPTION> mapper)
      Maps the Iterable's elements by applying the given mapping function (which might throw an exception), the returned list becomes the instance under test.

      Any checked exception raised in the function is rethrown wrapped in a RuntimeException.

      This allows to test values from the elements more safely than by using extracting(String).

      Let's have a look at an example: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 assertThat(fellowshipOfTheRing).map(input -> {
   if (input.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input.getName();
 }).contains("Frodo");
      Note that the order of mapped values is consistent with the order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted values order.
      Type Parameters:
      EXCEPTION - the exception type of ThrowingExtractor
      V - the type of elements extracted.
      Parameters:
      mapper - the function transforming input object to desired one
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.19.0

    • flatExtracting

      public <V> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> flatExtracting(Function<? super ELEMENT,? extends Collection<V>> extractor)
      Extracts Iterable elements values by applying a function and concatenates the result into a list that becomes the instance under test.

      Example: 

       CartoonCharacter bart = new CartoonCharacter("Bart Simpson");
 CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");
 CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");

 CartoonCharacter homer = new CartoonCharacter("Homer Simpson");
 homer.getChildren().add(bart);
 homer.getChildren().add(lisa);
 homer.getChildren().add(maggie);

 CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");
 CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");
 fred.getChildren().add(pebbles);

 List<CartoonCharacter> parents = list(homer, fred);

 // check children property which is a List<CartoonCharacter>
 assertThat(parents).flatExtracting(CartoonCharacter::getChildren)
                    .containsOnly(bart, lisa, maggie, pebbles);
      The extracted values order is consistent with both the order of the iterable itself as well as the extracted collections.
      Type Parameters:
      V - the type of extracted elements.
      Parameters:
      extractor - the Function transforming input object to an Iterable of desired ones
      Returns:
      a new assertion object whose object under test is the list of values extracted

    • flatMap

      public <V> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> flatMap(Function<? super ELEMENT,? extends Collection<V>> mapper)
      Maps the Iterable's elements under test by applying the given Function and flattens the resulting collections in a list becoming the object under test.

      Example: 

       CartoonCharacter bart = new CartoonCharacter("Bart Simpson");
 CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");
 CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");

 CartoonCharacter homer = new CartoonCharacter("Homer Simpson");
 homer.getChildren().add(bart);
 homer.getChildren().add(lisa);
 homer.getChildren().add(maggie);

 CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");
 CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");
 fred.getChildren().add(pebbles);

 List<CartoonCharacter> parents = list(homer, fred);

 // check children property which is a List<CartoonCharacter>
 assertThat(parents).flatMap(CartoonCharacter::getChildren)
                    .containsOnly(bart, lisa, maggie, pebbles);
      The mapped values order is consistent with both the order of the iterable itself as well as the mapped collections.
      Type Parameters:
      V - the type of mapped elements.
      Parameters:
      mapper - the Function transforming input object to an Iterable of desired ones
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.19.0

    • flatExtracting

      public <V, EXCEPTION extends Exception> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> flatExtracting(ThrowingExtractor<? super ELEMENT,? extends Collection<V>,EXCEPTION> extractor)
      Extracts Iterable elements values by applying a function (which might throw a checked exception) on them and concatenates/flattens the result into a single list that becomes the instance under test.

      Example: 

       CartoonCharacter bart = new CartoonCharacter("Bart Simpson");
 CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");
 CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");

 CartoonCharacter homer = new CartoonCharacter("Homer Simpson");
 homer.getChildren().add(bart);
 homer.getChildren().add(lisa);
 homer.getChildren().add(maggie);

 CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");
 CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");
 fred.getChildren().add(pebbles);

 List<CartoonCharacter> parents = list(homer, fred);

 // check children property where getChildren() can throw an Exception!
 assertThat(parents).flatExtracting(CartoonCharacter::getChildren)
                    .containsOnly(bart, lisa, maggie, pebbles);
      The extracted values order is consistent with both the order of the iterable itself as well as the extracted collections.
      Type Parameters:
      V - the type of extracted values.
      EXCEPTION - the exception type of ThrowingExtractor
      Parameters:
      extractor - the object transforming input object to an Iterable of desired ones
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.7.0

    • flatMap

      public <V, EXCEPTION extends Exception> AbstractListAssert<?,List<? extends V>,V,ObjectAssert<V>> flatMap(ThrowingExtractor<? super ELEMENT,? extends Collection<V>,EXCEPTION> mapper)
      Maps the Iterable's elements under test by applying a mapping function (which might throw a checked exception) and concatenates/flattens the result into a single list that becomes the instance under test.

      Example: 

       CartoonCharacter bart = new CartoonCharacter("Bart Simpson");
 CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");
 CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");

 CartoonCharacter homer = new CartoonCharacter("Homer Simpson");
 homer.getChildren().add(bart);
 homer.getChildren().add(lisa);
 homer.getChildren().add(maggie);

 CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");
 CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");
 fred.getChildren().add(pebbles);

 List<CartoonCharacter> parents = list(homer, fred);

 // check children property where getChildren() can throw an Exception!
 assertThat(parents).flatMap(CartoonCharacter::getChildren)
                    .containsOnly(bart, lisa, maggie, pebbles);
      The mapped values order is consistent with both the order of the iterable itself as well as the mapped collections.
      Type Parameters:
      V - the type of mapped values.
      EXCEPTION - the exception type of ThrowingExtractor
      Parameters:
      mapper - the object transforming input object to an Iterable of desired ones
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Since:
      3.19.0

    • flatExtracting

      @SafeVarargs public final AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatExtracting(Function<? super ELEMENT,?>... extractors)
      Extracts multiple values from each Iterable's element according to the given Functions and concatenates/flattens them in a list that becomes the instance under test.

      If extracted values were not flattened, instead of a simple list like (given 2 extractors): 

        element1.value1, element1.value2, element2.value1, element2.value2, ...
      we would get a list of list like: 
        list(element1.value1, element1.value2), list(element2.value1, element2.value2), ...

      Example: 

       // fellowshipOfTheRing is a List<TolkienCharacter>

 // values are extracted in order and flattened: age1, name1, age2, name2, age3 ...
 assertThat(fellowshipOfTheRing).flatExtracting(TolkienCharacter::getAge,
                                                TolkienCharacter::getName)
                                .contains(33 ,"Frodo",
                                          1000, "Legolas",
                                          87, "Aragorn");
      The resulting extracted values list is ordered by Iterable's element first and then extracted values, this is why is in the example age values come before names.
      Parameters:
      extractors - all the extractors to apply on each actual Iterable's elements
      Returns:
      a new assertion object whose object under test is a flattened list of all extracted values.

    • flatMap

      @SafeVarargs public final AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatMap(Function<? super ELEMENT,?>... mappers)
      Maps multiple values from each Iterable's element according to the given Functions and concatenates/flattens them in a list that becomes the instance under test.

      If mapped values were not flattened, instead of a simple list like (given 2 extractors): 

        element1.value1, element1.value2, element2.value1, element2.value2, ...
      we would get a list of list like: 
        list(element1.value1, element1.value2), list(element2.value1, element2.value2), ...

      Example: 

       // fellowshipOfTheRing is a List<TolkienCharacter>

 // values are extracted in order and flattened: age1, name1, age2, name2, age3 ...
 assertThat(fellowshipOfTheRing).flatMap(TolkienCharacter::getAge,
                                         TolkienCharacter::getName)
                                .contains(33 ,"Frodo",
                                          1000, "Legolas",
                                          87, "Aragorn");
      The resulting mapped values list is ordered by Iterable's element first and then mapped values, this is why is in the example age values come before names.
      Parameters:
      mappers - all the mappers to apply on each actual Iterable's elements
      Returns:
      a new assertion object whose object under test is a flattened list of all mapped values.
      Since:
      3.19.0

    • flatExtractingForProxy

      protected AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatExtractingForProxy(Function<? super ELEMENT,?>[] extractors)

    • flatExtracting

      @SafeVarargs public final <EXCEPTION extends Exception> AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatExtracting(ThrowingExtractor<? super ELEMENT,?,EXCEPTION>... extractors)
      Extracts multiple values from each Iterable's element according to the given ThrowingExtractors and concatenates/flattens them in a list that becomes the object under test.

      If extracted values were not flattened, instead of a simple list like (given 2 extractors): 

        element1.value1, element1.value2, element2.value1, element2.value2, ...
      we would get a list of list like: 
        list(element1.value1, element1.value2), list(element2.value1, element2.value2), ...

      Example: 

       // fellowshipOfTheRing is a List<TolkienCharacter>

 // values are extracted in order and flattened: age1, name1, age2, name2, age3 ...
 assertThat(fellowshipOfTheRing).flatExtracting(input -> {
   if (input.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input.getName();
 }, input2 -> {
   if (input2.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input2.getAge();
 }).contains(33 ,"Frodo",
     1000, "Legolas",
     87, "Aragorn");
      The resulting extracted values list is ordered by Iterable's element first and then extracted values, this is why is in the example age values come before names.
      Type Parameters:
      EXCEPTION - the exception type of ThrowingExtractor
      Parameters:
      extractors - all the extractors to apply on each actual Iterable's elements
      Returns:
      a new assertion object whose object under test is a flattened list of all extracted values.
      Since:
      3.7.0

    • flatMap

      @SafeVarargs public final <EXCEPTION extends Exception> AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatMap(ThrowingExtractor<? super ELEMENT,?,EXCEPTION>... mappers)
      Maps multiple values from each Iterable's element according to the given ThrowingExtractors and concatenates/flattens them in a list that becomes the object under test.

      If mapped values were not flattened, instead of a simple list like (given 2 mappers): 

        element1.value1, element1.value2, element2.value1, element2.value2, ...
      we would get a list of list like: 
        list(element1.value1, element1.value2), list(element2.value1, element2.value2), ...

      Example: 

       // fellowshipOfTheRing is a List<TolkienCharacter>

 // values are extracted in order and flattened: age1, name1, age2, name2, age3 ...
 assertThat(fellowshipOfTheRing).flatMap(input -> {
   if (input.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input.getName();
 }, input2 -> {
   if (input2.getAge() < 20) {
     throw new Exception("age < 20");
   }
   return input2.getAge();
 }).contains(33 ,"Frodo",
     1000, "Legolas",
     87, "Aragorn");
      The resulting mapped values list is ordered by Iterable's element first and then mapped values, this is why is in the example age values come before names.
      Type Parameters:
      EXCEPTION - the exception type of ThrowingExtractor
      Parameters:
      mappers - all the mappers to apply on each actual Iterable's elements
      Returns:
      a new assertion object whose object under test is a flattened list of all extracted values.
      Since:
      3.19.0

    • flatExtracting

      public AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatExtracting(String fieldOrPropertyName)
      Extract Iterable's elements values corresponding to the given property/field name and concatenates them into a list becoming the new instance under test.

      This allows testing the elements extracted values that are iterables or arrays.

      For example: 

       CartoonCharacter bart = new CartoonCharacter("Bart Simpson");
 CartoonCharacter lisa = new CartoonCharacter("Lisa Simpson");
 CartoonCharacter maggie = new CartoonCharacter("Maggie Simpson");
 CartoonCharacter homer = new CartoonCharacter("Homer Simpson");
 homer.getChildren().add(bart);
 homer.getChildren().add(lisa);
 homer.getChildren().add(maggie);

 CartoonCharacter pebbles = new CartoonCharacter("Pebbles Flintstone");
 CartoonCharacter fred = new CartoonCharacter("Fred Flintstone");
 fred.getChildren().add(pebbles);

 List<CartoonCharacter> parents = list(homer, fred);

 // check children which is a List<CartoonCharacter>
 assertThat(parents).flatExtracting("children")
                    .containsOnly(bart, lisa, maggie, pebbles);
      The order of extracted values is consisted with both the order of the iterable itself as well as the extracted collections.
      Parameters:
      fieldOrPropertyName - the object transforming input object to an Iterable of desired ones
      Returns:
      a new assertion object whose object under test is the list of values extracted
      Throws:
      IllegalArgumentException - if one of the extracted property value was not an array or an iterable.

    • extracting

      @SafeVarargs public final AbstractListAssert<?,List<? extends Tuple>,Tuple,ObjectAssert<Tuple>> extracting(Function<? super ELEMENT,?>... extractors)
      Use the given Functions to extract the values from the Iterable's elements into a new Iterable composed of Tuples (a simple data structure containing the extracted values), this new Iterable becoming the object under test.

      It allows you to test values from the Iterable's elements instead of testing the elements themselves, which sometimes can be much less work!

      The Tuple data correspond to the extracted values from the Iterable's elements, for instance if you pass functions extracting "id", "name" and "email" values then each Tuple data will be composed of an id, a name and an email extracted from the element of the initial Iterable (the Tuple's data order is the same as the given functions order).

      Let's take a look at an example to make things clearer: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // let's verify 'name', 'age' and Race of some TolkienCharacter in fellowshipOfTheRing:
 assertThat(fellowshipOfTheRing).extracting(TolkienCharacter::getName,
                                            character -> character.getAge(),
                                            TolkienCharacter::getRace)
                                .containsOnly(tuple("Frodo", 33, HOBBIT),
                                              tuple("Sam", 38, HOBBIT),
                                              tuple("Gandalf", 2020, MAIA),
                                              tuple("Legolas", 1000, ELF),
                                              tuple("Pippin", 28, HOBBIT),
                                              tuple("Gimli", 139, DWARF),
                                              tuple("Aragorn", 87, MAN),
                                              tuple("Boromir", 37, MAN));
      You can use lambda expression or a method reference to extract the expected values.

      Use Tuple.tuple(Object...) to initialize the expected values.

      Note that the order of the extracted tuples list is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted tuples order.

      Parameters:
      extractors - the extractor functions to extract a value from an element of the Iterable under test.
      Returns:
      a new assertion object whose object under test is the list of Tuples containing the extracted values.

    • extractingForProxy

      protected AbstractListAssert<?,List<? extends Tuple>,Tuple,ObjectAssert<Tuple>> extractingForProxy(Function<? super ELEMENT,?>[] extractors)

    • map

      @SafeVarargs public final AbstractListAssert<?,List<? extends Tuple>,Tuple,ObjectAssert<Tuple>> map(Function<? super ELEMENT,?>... mappers)
      Use the given Functions to map the Iterable's elements into a List of Tuples (a simple data structure containing the mapped values), this new list becoming the object under test.

      This allows you to test values from the Iterable's elements instead of testing the elements themselves, which sometimes can be much less work!

      The Tuple data correspond to the extracted values from the Iterable's elements, for instance if you pass functions mapping "id", "name" and "email" values then each Tuple data will be composed of an id, a name and an email mapped from the element of the initial Iterable (the Tuple's data order is the same as the given functions order).

      Let's take a look at an example to make things clearer: 

       // Build a list of TolkienCharacter, a TolkienCharacter has a name, and age and a Race (a specific class)
 // they can be public field or properties, both can be extracted.
 List<TolkienCharacter> fellowshipOfTheRing = new ArrayList<TolkienCharacter>();

 fellowshipOfTheRing.add(new TolkienCharacter("Frodo", 33, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Sam", 38, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gandalf", 2020, MAIA));
 fellowshipOfTheRing.add(new TolkienCharacter("Legolas", 1000, ELF));
 fellowshipOfTheRing.add(new TolkienCharacter("Pippin", 28, HOBBIT));
 fellowshipOfTheRing.add(new TolkienCharacter("Gimli", 139, DWARF));
 fellowshipOfTheRing.add(new TolkienCharacter("Aragorn", 87, MAN);
 fellowshipOfTheRing.add(new TolkienCharacter("Boromir", 37, MAN));

 // let's verify 'name', 'age' and Race of some TolkienCharacter in fellowshipOfTheRing:
 assertThat(fellowshipOfTheRing).map(TolkienCharacter::getName,
                                     character -> character.getAge(),
                                     TolkienCharacter::getRace)
                                .containsOnly(tuple("Frodo", 33, HOBBIT),
                                              tuple("Sam", 38, HOBBIT),
                                              tuple("Gandalf", 2020, MAIA),
                                              tuple("Legolas", 1000, ELF),
                                              tuple("Pippin", 28, HOBBIT),
                                              tuple("Gimli", 139, DWARF),
                                              tuple("Aragorn", 87, MAN),
                                              tuple("Boromir", 37, MAN));
      You can use lambda expression or a method reference to extract the expected values.

      Use Tuple.tuple(Object...) to initialize the expected values.

      Note that the order of the extracted tuples list is consistent with the iteration order of the Iterable under test, for example if it's a HashSet, you won't be able to make any assumptions on the extracted tuples order.

      Parameters:
      mappers - the mapper functions to extract a value from an element of the Iterable under test.
      Returns:
      a new assertion object whose object under test is the list of Tuples containing the extracted values.
      Since:
      3.19.0

    • flatExtracting

      public AbstractListAssert<?,List<? extends Object>,Object,ObjectAssert<Object>> flatExtracting(String... fieldOrPropertyNames)
      Extract the given property/field values from each Iterable's element and flatten the extracted values in a list that is used as the new object under test.

      Given 2 properties, if the extracted values were not flattened, instead having a simple list like: 

        element1.value1, element1.value2, element2.value1, element2.value2, ...
      ... we would get a list of list: 
        list(element1.value1, element1.value2), list(element2.value1, element2.value2), ...

      Example: 

       // fellowshipOfTheRing is a List<TolkienCharacter>

 // values are extracted in order and flattened: age1, name1, age2, name2, age3 ...
 assertThat(fellowshipOfTheRing).flatExtracting("age", "name")
                                .contains(33 ,"Frodo",
                                          1000, "Legolas",
                                          87, "Aragorn");
      Parameters:
      fieldOrPropertyNames - the field and/or property names to extract from each actual Iterable's element
      Returns:
      a new assertion object whose object under test is a flattened list of all extracted values.
      Throws:
      IllegalArgumentException - if fieldOrPropertyNames vararg is null or empty
      Since:
      2.5.0 / 3.5.0

    • containsExactlyElementsOf

      public SELF containsExactlyElementsOf(Iterable<? extends ELEMENT> iterable)
      Same as ObjectEnumerableAssert.containsExactly(Object...) but handle the Iterable to array conversion : verifies that actual contains exactly the elements of the given iterable and nothing else in the same order.

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass
 assertThat(elvesRings).containsExactlyElementsOf(newLinkedList(vilya, nenya, narya));

 // assertion will fail as actual and expected order differ
 assertThat(elvesRings).containsExactlyElementsOf(newLinkedList(nenya, vilya, narya));

      If you want to directly specify the elements to check, use containsExactly(Object...) instead.

      Specified by:
      containsExactlyElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the given Iterable we will get elements from.
      Returns:
      this assertion object.

    • containsOnlyElementsOf

      @Deprecated public SELF containsOnlyElementsOf(Iterable<? extends ELEMENT> iterable)
      Deprecated.
      Same semantic as ObjectEnumerableAssert.containsOnly(Object[]) : verifies that actual contains all the elements of the given iterable and nothing else, in any order and ignoring duplicates (i.e. once a value is found, its duplicates are also considered found).

      This assertion has been deprecated because its name is confusing, users were expecting it to behave like ObjectEnumerableAssert.isSubsetOf(Iterable).

      For example this assertion fails when users expected it to pass: 

       Iterable<Ring> rings = list(nenya, vilya);

 // assertion fails because narya is not in rings, confusing!
 assertThat(rings).containsOnlyElementsOf(list(nenya, vilya, narya));

      Use ObjectEnumerableAssert.isSubsetOf(Iterable) to check that actual is a subset of given iterable, or if you need to same assertion semantics use ObjectEnumerableAssert.hasSameElementsAs(Iterable).

      Examples: 

       Iterable<Ring> rings = newArrayList(nenya, vilya);

 // assertion will pass
 assertThat(rings).containsOnlyElementsOf(list(nenya, vilya))
                  .containsOnlyElementsOf(list(nenya, nenya, vilya, vilya));
 assertThat(list(nenya, nenya, vilya, vilya)).containsOnlyElementsOf(rings);

 // assertion will fail as actual does not contain narya
 assertThat(rings).containsOnlyElementsOf(list(nenya, vilya, narya));
 // assertion will fail as actual contains nenya
 assertThat(rings).containsOnlyElementsOf(list(vilya));

      If you want to directly specify the elements to check, use containsOnly(Object...) instead.

      Specified by:
      containsOnlyElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the given Iterable we will get elements from.
      Returns:
      this assertion object.

    • containsOnlyOnceElementsOf

      public SELF containsOnlyOnceElementsOf(Iterable<? extends ELEMENT> iterable)
      Same semantic as ObjectEnumerableAssert.containsOnlyOnce(Object...) : verifies that the actual group contains the elements of the given iterable only once.

      Examples : 

       // assertions will pass
 assertThat(list("winter", "is", "coming")).containsOnlyOnceElementsOf(list("winter"))
                                           .containsOnlyOnceElementsOf(list("coming", "winter"));

 // assertions will fail
 assertThat(list("winter", "is", "coming")).containsOnlyOnceElementsOf(list("Lannister"));
 assertThat(list("Arya", "Stark", "daughter", "of", "Ned", "Stark")).containsOnlyOnceElementsOf(list("Stark"));
 assertThat(list("Arya", "Stark", "daughter", "of", "Ned", "Stark")).containsOnlyOnceElementsOf(list("Stark", "Lannister", "Arya"));

      If you want to directly specify the elements to check with, use ObjectEnumerableAssert.containsOnlyOnce(Object...) instead.

      Specified by:
      containsOnlyOnceElementsOf in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the given Iterable we will get elements from.
      Returns:
      this assertion object.

    • hasSameElementsAs

      public SELF hasSameElementsAs(Iterable<? extends ELEMENT> iterable)
      Verifies that actual contains all the elements of the given iterable and nothing else, in any order and ignoring duplicates (i.e. once a value is found, its duplicates are also considered found).

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertions will pass:
 assertThat(elvesRings).hasSameElementsAs(newArrayList(nenya, narya, vilya))
                       .hasSameElementsAs(newArrayList(nenya, narya, vilya, nenya));

 // assertions will fail:
 assertThat(elvesRings).hasSameElementsAs(newArrayList(nenya, narya));
 assertThat(elvesRings).hasSameElementsAs(newArrayList(nenya, narya, vilya, oneRing));
      Specified by:
      hasSameElementsAs in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      iterable - the Iterable whose elements we expect to be present
      Returns:
      this assertion object

    • usingComparatorForElementFieldsWithNames

      @Deprecated public <T> SELF usingComparatorForElementFieldsWithNames(Comparator<T> comparator, String... elementPropertyOrFieldNames)
      Deprecated.
      This method is used with usingFieldByFieldElementComparator() which is deprecated in favor of usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) or usingRecursiveComparison().

      When using usingRecursiveComparison() the equivalent is:

      and when using RecursiveComparisonConfiguration:

      Deprecated javadoc

      Allows to set a comparator to compare properties or fields of elements with the given names. A typical usage is for comparing fields of numeric type at a given precision.

      To be used, comparators need to be specified by this method before calling any of:

      Comparators specified by this method have precedence over comparators specified by usingComparatorForElementFieldsWithType.

      Example: 

       public class TolkienCharacter {
   private String name;
   private double height;
   // constructor omitted
 }

 TolkienCharacter frodo = new TolkienCharacter("Frodo", 1.2);
 TolkienCharacter tallerFrodo = new TolkienCharacter("Frodo", 1.3);
 TolkienCharacter reallyTallFrodo = new TolkienCharacter("Frodo", 1.9);

 Comparator<Double> closeEnough = new Comparator<Double>() {
   double precision = 0.5;
   public int compare(Double d1, Double d2) {
     return Math.abs(d1 - d2) <= precision ? 0 : 1;
   }
 };

 // assertions will pass
 assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, "height")
                          .usingFieldByFieldElementComparator()
                          .contains(tallerFrodo);

 assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, "height")
                          .usingElementComparatorOnFields("height")
                          .contains(tallerFrodo);

 assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, "height")
                          .usingElementComparatorIgnoringFields("name")
                          .contains(tallerFrodo);

 assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, "height")
                          .usingRecursiveFieldByFieldElementComparator()
                          .contains(tallerFrodo);

 // assertion will fail
 assertThat(asList(frodo)).usingComparatorForElementFieldsWithNames(closeEnough, "height")
                          .usingFieldByFieldElementComparator()
                          .containsExactly(reallyTallFrodo);
      Type Parameters:
      T - the type of elements to compare.
      Parameters:
      comparator - the Comparator to use
      elementPropertyOrFieldNames - the names of the properties and/or fields of the elements the comparator should be used for
      Returns:
      this assertions object
      Since:
      2.5.0 / 3.5.0

    • usingComparatorForElementFieldsWithType

      @Deprecated public <T> SELF usingComparatorForElementFieldsWithType(Comparator<T> comparator, Class<T> type)
      Deprecated.
      This method is used with usingFieldByFieldElementComparator() which is deprecated in favor of usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) or usingRecursiveComparison().

      When using usingRecursiveComparison() the equivalent is:

      and when using RecursiveComparisonConfiguration:

      Deprecated javadoc

      Allows to set a specific comparator to compare properties or fields of elements with the given type. A typical usage is for comparing fields of numeric type at a given precision.

      To be used, comparators need to be specified by this method before calling any of:

      Comparators specified by usingComparatorForElementFieldsWithNames have precedence over comparators specified by this method.

      Example: 

       public class TolkienCharacter {
   private String name;
   private double height;
   // constructor omitted
 }
 TolkienCharacter frodo = new TolkienCharacter("Frodo", 1.2);
 TolkienCharacter tallerFrodo = new TolkienCharacter("Frodo", 1.3);
 TolkienCharacter reallyTallFrodo = new TolkienCharacter("Frodo", 1.9);

 Comparator<Double> closeEnough = new Comparator<Double>() {
   double precision = 0.5;
   public int compare(Double d1, Double d2) {
     return Math.abs(d1 - d2) <= precision ? 0 : 1;
   }
 };

 // assertions will pass
 assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)
                                 .usingFieldByFieldElementComparator()
                                 .contains(tallerFrodo);

 assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)
                                 .usingElementComparatorOnFields("height")
                                 .contains(tallerFrodo);

 assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)
                                 .usingElementComparatorIgnoringFields("name")
                                 .contains(tallerFrodo);

 assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)
                                 .usingRecursiveFieldByFieldElementComparator()
                                 .contains(tallerFrodo);

 // assertion will fail
 assertThat(Arrays.asList(frodo)).usingComparatorForElementFieldsWithType(closeEnough, Double.class)
                                 .usingFieldByFieldElementComparator()
                                 .contains(reallyTallFrodo);
      Type Parameters:
      T - the type of elements to compare.
      Parameters:
      comparator - the Comparator to use
      type - the Class of the type of the element fields the comparator should be used for
      Returns:
      this assertions object
      Since:
      2.5.0 / 3.5.0

    • usingComparatorForType

      public <T> SELF usingComparatorForType(Comparator<T> comparator, Class<T> type)
      Allows to set a specific comparator for the given type of elements or their fields. Extends usingComparatorForElementFieldsWithType(java.util.Comparator<T>, java.lang.Class<T>) by applying comparator specified for given type to elements themselves, not only to their fields.

      Usage of this method affects comparators set by next methods:

      Example: 

      
     // assertion will pass
     assertThat(asList("some", new BigDecimal("4.2")))
         .usingComparatorForType(BIG_DECIMAL_COMPARATOR, BigDecimal.class)
         .contains(new BigDecimal("4.20"));
      Type Parameters:
      T - the type of elements to compare.
      Parameters:
      comparator - the Comparator to use
      type - the Class of the type of the element or element fields the comparator should be used for
      Returns:
      this assertions object
      Since:
      2.9.0 / 3.9.0

    • usingFieldByFieldElementComparator

      @Deprecated public SELF usingFieldByFieldElementComparator()
      Deprecated.
      This method is deprecated because it performs a shallow field by field comparison, i.e. elements are compared field by field but the fields are compared with equals, use usingRecursiveFieldByFieldElementComparator() or usingRecursiveComparison() instead to perform a true recursive comparison.
      See https://assertj.github.io/doc/#assertj-core-recursive-comparison
      Deprecated javadoc

      Use field/property by field/property comparison (including inherited fields/properties) instead of relying on actual type A equals method to compare group elements for incoming assertion checks. Private fields are included but this can be disabled using Assertions.setAllowExtractingPrivateFields(boolean).

      This can be handy if equals method of the objects to compare does not suit you.

      Note that the comparison is not recursive, if one of the fields/properties is an Object, it will be compared to the other field/property using its equals method.

      You can specify a custom comparator per name or type of element field with usingComparatorForElementFieldsWithNames(Comparator, String...) and usingComparatorForElementFieldsWithType(Comparator, Class).

      Example: 

       TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);

 // Fail if equals has not been overridden in TolkienCharacter as equals default implementation only compares references
 assertThat(newArrayList(frodo)).contains(frodoClone);

 // frodo and frodoClone are equals when doing a field by field comparison.
 assertThat(newArrayList(frodo)).usingFieldByFieldElementComparator().contains(frodoClone);
      Returns:
      this assertion object.

    • usingRecursiveFieldByFieldElementComparator

      public SELF usingRecursiveFieldByFieldElementComparator()
      Enable using a recursive field by field comparison strategy similar to usingRecursiveComparison() but contrary to the latter you can chain any iterable assertions after this method (this is why this method exists).

      This method uses the default RecursiveComparisonConfiguration, if you need to customize it use usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) instead.

      Breaking change: since 3.20.0 the comparison won't use any comparators set with:

      These features (and many more) are provided through usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) with a customized RecursiveComparisonConfiguration where there methods are called:

      There are differences between this approach and usingRecursiveComparison():

      This last point makes sense, take the contains(Object...) assertion, it would not be relevant to report the differences of all the iterable's elements differing from the values to look for.

      Example: 

       public class Person {
   String name;
   boolean hasPhd;
 }

 public class Doctor {
  String name;
  boolean hasPhd;
 }

 Doctor drSheldon = new Doctor("Sheldon Cooper", true);
 Doctor drLeonard = new Doctor("Leonard Hofstadter", true);
 Doctor drRaj = new Doctor("Raj Koothrappali", true);

 Person sheldon = new Person("Sheldon Cooper", true);
 Person leonard = new Person("Leonard Hofstadter", true);
 Person raj = new Person("Raj Koothrappali", true);
 Person howard = new Person("Howard Wolowitz", true);

 List<Doctor> doctors = list(drSheldon, drLeonard, drRaj);
 List<Person> people = list(sheldon, leonard, raj);

 // assertion succeeds as both lists contains equivalent items in order.
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator()
                    .contains(sheldon);

 // assertion fails because leonard names are different.
 leonard.setName("Leonard Ofstater");
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator()
                    .contains(leonard);

 // assertion fails because howard is missing and leonard is not expected.
 people = list(howard, sheldon, raj)
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator()
                    .contains(howard);

      Another point worth mentioning: elements order does matter if the expected iterable is ordered, for example comparing a Set<Person> to a List<Person> fails as List is ordered and Set is not.
      The ordering can be ignored by calling ignoringCollectionOrder allowing ordered/unordered iterable comparison, note that ignoringCollectionOrder is applied recursively on any nested iterable fields, if this behavior is too generic, use the more fine grained ignoringCollectionOrderInFields or ignoringCollectionOrderInFieldsMatchingRegexes.

      Returns:
      this assertion object.
      Since:
      2.5.0 / 3.5.0 - breaking change in 3.20.0
      See Also:

    • usingRecursiveFieldByFieldElementComparator

      public SELF usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration configuration)
      Enable using a recursive field by field comparison strategy similar to usingRecursiveComparison() but contrary to the latter you can chain any iterable assertions after this method (this is why this method exists).

      The given RecursiveComparisonConfiguration is used to tweak the comparison behavior, for example by ignoring collection order.

      Warning: the comparison won't use any comparators set with:

      These features (and many more) are provided through RecursiveComparisonConfiguration with:

      RecursiveComparisonConfiguration exposes a builder to ease setting the comparison behaviour, call RecursiveComparisonConfiguration.builder() to start building your configuration.

      There are differences between this approach and usingRecursiveComparison():

      This last point makes sense, take the contains(Object...) assertion, it would not be relevant to report the differences of all the iterable's elements differing from the values to look for.

      Example: 

       public class Person {
   String name;
   boolean hasPhd;
 }

 public class Doctor {
  String name;
  boolean hasPhd;
 }

 Doctor drSheldon = new Doctor("Sheldon Cooper", true);
 Doctor drLeonard = new Doctor("Leonard Hofstadter", true);
 Doctor drRaj = new Doctor("Raj Koothrappali", true);

 Person sheldon = new Person("Sheldon Cooper", false);
 Person leonard = new Person("Leonard Hofstadter", false);
 Person raj = new Person("Raj Koothrappali", false);
 Person howard = new Person("Howard Wolowitz", false);

 List<Doctor> doctors = list(drSheldon, drLeonard, drRaj);
 List<Person> people = list(sheldon, leonard, raj);

 RecursiveComparisonConfiguration configuration = RecursiveComparisonConfiguration.builder()
                                                                                  .withIgnoredFields​("hasPhd");

 // assertion succeeds as both lists contains equivalent items in order.
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)
                    .contains(sheldon);

 // assertion fails because leonard names are different.
 leonard.setName("Leonard Ofstater");
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)
                    .contains(leonard);

 // assertion fails because howard is missing and leonard is not expected.
 people = list(howard, sheldon, raj)
 assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration)
                    .contains(howard);
      A detailed documentation for the recursive comparison is available here: https://assertj.github.io/doc/#assertj-core-recursive-comparison.

      The default recursive comparison behavior is configured as follows:

      • different types of iterable can be compared by default, this allows to compare for example an List<Person> and a LinkedHashSet<PersonDto>.
        This behavior can be turned off by calling withStrictTypeChecking.
      • overridden equals methods are used in the comparison (unless stated otherwise - see https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals)
      • the following types are compared with these comparators:
        • java.lang.Double: DoubleComparator with precision of 1.0E-15
        • java.lang.Float: FloatComparator with precision of 1.0E-6

      Another point worth mentioning: elements order does matter if the expected iterable is ordered, for example comparing a Set<Person> to a List<Person> fails as List is ordered and Set is not.
      The ordering can be ignored by calling ignoringCollectionOrder allowing ordered/unordered iterable comparison, note that ignoringCollectionOrder is applied recursively on any nested iterable fields, if this behavior is too generic, use the more fine grained ignoringCollectionOrderInFields or ignoringCollectionOrderInFieldsMatchingRegexes.

      Parameters:
      configuration - the recursive comparison configuration.
      Returns:
      this assertion object.
      Since:
      3.17.0
      See Also:

    • usingRecursiveComparison

      public RecursiveComparisonAssert<?> usingRecursiveComparison()
      Enable using a recursive field by field comparison strategy when calling the chained RecursiveComparisonAssert,

      There are differences between this approach and usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration):

      If you need to chain iterable assertions using recursive comparisons call usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) instead.

      Example: 

       public class Person {
   String name;
   boolean hasPhd;
 }

 public class Doctor {
  String name;
  boolean hasPhd;
 }

 Doctor drSheldon = new Doctor("Sheldon Cooper", true);
 Doctor drLeonard = new Doctor("Leonard Hofstadter", true);
 Doctor drRaj = new Doctor("Raj Koothrappali", true);

 Person sheldon = new Person("Sheldon Cooper", true);
 Person leonard = new Person("Leonard Hofstadter", true);
 Person raj = new Person("Raj Koothrappali", true);
 Person howard = new Person("Howard Wolowitz", false);

 List<Doctor> doctors = Arrays.asList(drSheldon, drLeonard, drRaj);
 List<Person> people = Arrays.asList(sheldon, leonard, raj);

 // assertion succeeds as both lists contains equivalent items in order.
 assertThat(doctors).usingRecursiveComparison()
                    .isEqualTo(people);

 // assertion fails because leonard names are different.
 leonard.setName("Leonard Ofstater");
 assertThat(doctors).usingRecursiveComparison()
                    .isEqualTo(people);

 // assertion fails because howard is missing and leonard is not expected.
 people = Arrays.asList(howard, sheldon, raj)
 assertThat(doctors).usingRecursiveComparison()
                    .isEqualTo(people);
      A detailed documentation for the recursive comparison is available here: https://assertj.github.io/doc/#assertj-core-recursive-comparison.

      The default recursive comparison behavior is configured as follows:

      • different types of iterable can be compared by default, this allows to compare for example an List<Person> and a LinkedHashSet<PersonDto>.
        This behavior can be turned off by calling withStrictTypeChecking.
      • overridden equals methods are used in the comparison (unless stated otherwise - see https://assertj.github.io/doc/#assertj-core-recursive-comparison-ignoring-equals)
      • the following types are compared with these comparators:
        • java.lang.Double: DoubleComparator with precision of 1.0E-15
        • java.lang.Float: FloatComparator with precision of 1.0E-6

      Another point worth mentioning: elements order does matter if the expected iterable is ordered, for example comparing a Set<Person> to a List<Person> fails as List is ordered and Set is not.
      The ordering can be ignored by calling ignoringCollectionOrder allowing ordered/unordered iterable comparison, note that ignoringCollectionOrder is applied recursively on any nested iterable fields, if this behavior is too generic, use the more fine grained ignoringCollectionOrderInFields or ignoringCollectionOrderInFieldsMatchingRegexes.

      At the moment, only `isEqualTo` can be chained after this method but there are plans to provide assertions.

      Overrides:
      usingRecursiveComparison in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      a new RecursiveComparisonAssert instance
      Since:
      3.15.0
      See Also:

    • usingRecursiveComparison

      public RecursiveComparisonAssert<?> usingRecursiveComparison(RecursiveComparisonConfiguration recursiveComparisonConfiguration)
      Same as usingRecursiveComparison() but allows to specify your own RecursiveComparisonConfiguration.

      Another difference is that any comparators previously registered with usingComparatorForType(Comparator, Class) will be used in the comparison.

      Overrides:
      usingRecursiveComparison in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      recursiveComparisonConfiguration - the RecursiveComparisonConfiguration used in the chained isEqualTo assertion.
      Returns:
      a new RecursiveComparisonAssert instance built with the given RecursiveComparisonConfiguration.
      Since:
      3.15.0

    • usingElementComparatorOnFields

      @Deprecated public SELF usingElementComparatorOnFields(String... fields)
      Deprecated.
      This method is deprecated because it performs a shallow field by field comparison, i.e. elements are compared field by field but the fields are compared with equals, use usingRecursiveFieldByFieldElementComparatorOnFields(String...) instead.
      See https://assertj.github.io/doc/#assertj-core-recursive-comparison
      Deprecated javadoc

      Use field/property by field/property comparison on the given fields/properties only (including inherited fields/properties) instead of relying on actual type A equals method to compare group elements for incoming assertion checks. Private fields are included but this can be disabled using Assertions.setAllowExtractingPrivateFields(boolean).

      This can be handy if equals method of the objects to compare does not suit you.

      You can specify a custom comparator per name or type of element field with usingComparatorForElementFieldsWithNames(Comparator, String...) and usingComparatorForElementFieldsWithType(Comparator, Class).

      Note that the comparison is not recursive, if one of the fields/properties is an Object, it will be compared to the other field/property using its equals method.

      Example: 
       TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);

 // frodo and sam both are hobbits, so they are equals when comparing only race
 assertThat(newArrayList(frodo)).usingElementComparatorOnFields("race").contains(sam); // OK

 // ... but not when comparing both name and race
 assertThat(newArrayList(frodo)).usingElementComparatorOnFields("name", "race").contains(sam); // FAIL
      Parameters:
      fields - the fields/properties to compare using element comparators
      Returns:
      this assertion object.
      See Also:

    • usingRecursiveFieldByFieldElementComparatorOnFields

      public SELF usingRecursiveFieldByFieldElementComparatorOnFields(String... fields)
      The assertions chained after this method will use a recursive field by field comparison on the given fields (including inherited fields) instead of relying on the element equals method. This is handy when the element equals method is not overridden or implemented as you expect.

      Nested fields are supported and are expressed like: name.first

      The comparison is recursive: elements are compared field by field, if a field type has fields they are also compared field by field (and so on).

      Example: 

       Player derrickRose = new Player(new Name("Derrick", "Rose"), "Chicago Bulls");
 derrickRose.nickname = new Name("Crazy", "Dunks");

 Player jalenRose = new Player(new Name("Jalen", "Rose"), "Chicago Bulls");
 jalenRose.nickname = new Name("Crazy", "Defense");

 // assertion succeeds as all compared fields match
 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparatorOnFields("name.last", "team", "nickname.first")
                              .contains(jalenRose);

 // assertion fails, name.first values differ
 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparatorOnFields("name")
                              .contains(jalenRose);

      This method is actually a shortcut of usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) with a configuration comparing only the given fields, the previous example can be written as: 

       RecursiveComparisonConfiguration configuration = RecursiveComparisonConfiguration.builder()
                                                                                  .withComparedFields("name.last", "team", "nickname.first")
                                                                                  .build();

 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparator(configuration)
                              .contains(jalenRose);
      The recursive comparison is documented here: https://assertj.github.io/doc/#assertj-core-recursive-comparison

      Parameters:
      fields - the field names to exclude in the elements comparison.
      Returns:
      this assertion object.
      Since:
      3.20.0
      See Also:

    • usingComparisonStrategy

      protected SELF usingComparisonStrategy(org.assertj.core.internal.ComparisonStrategy comparisonStrategy)

    • usingElementComparatorIgnoringFields

      @Deprecated public SELF usingElementComparatorIgnoringFields(String... fields)
      Deprecated.
      This method is deprecated because it performs a shallow field by field comparison, i.e. elements are compared field by field but the fields are compared with equals, use usingRecursiveFieldByFieldElementComparatorIgnoringFields(String...) instead.
      See https://assertj.github.io/doc/#assertj-core-recursive-comparison
      Deprecated javadoc

      Use field/property by field/property comparison on all fields/properties except the given ones (including inherited fields/properties) instead of relying on actual type A equals method to compare group elements for incoming assertion checks. Private fields are included but this can be disabled using Assertions.setAllowExtractingPrivateFields(boolean).

      This can be handy if equals method of the objects to compare does not suit you.

      You can specify a custom comparator per name or type of element field with usingComparatorForElementFieldsWithNames(Comparator, String...) and usingComparatorForElementFieldsWithType(Comparator, Class).

      Note that the comparison is not recursive, if one of the fields/properties is an Object, it will be compared to the other field/property using its equals method.

      Example: 
       TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);

 // frodo and sam both are hobbits, so they are equals when comparing only race (i.e. ignoring all other fields)
 assertThat(newArrayList(frodo)).usingElementComparatorIgnoringFields("name", "age").contains(sam); // OK

 // ... but not when comparing both name and race
 assertThat(newArrayList(frodo)).usingElementComparatorIgnoringFields("age").contains(sam); // FAIL
      Parameters:
      fields - the field names to exclude in the elements comparison.
      Returns:
      this assertion object.
      See Also:

    • usingRecursiveFieldByFieldElementComparatorIgnoringFields

      public SELF usingRecursiveFieldByFieldElementComparatorIgnoringFields(String... fields)
      The assertions chained after this method will use a recursive field by field comparison on all fields (including inherited fields) except the given ones instead of relying on the element equals method. This is handy when the element equals method is not overridden or implemented as you expect.

      Nested fields are supported and are expressed like: name.first

      The comparison is recursive: elements are compared field by field, if a field type has fields they are also compared field by field (and so on).

      Example: 

       Player derrickRose = new Player(new Name("Derrick", "Rose"), "Chicago Bulls");
 derrickRose.nickname = new Name("Crazy", "Dunks");

 Player jalenRose = new Player(new Name("Jalen", "Rose"), "Chicago Bulls");
 jalenRose.nickname = new Name("Crazy", "Defense");

 // assertion succeeds
 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparatorIgnoringFields("name.first", "nickname.last")
                              .contains(jalenRose);

 // assertion fails, names are ignored but nicknames are not and nickname.last values differ
 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparatorIgnoringFields("name")
                              .contains(jalenRose);

      This method is actually a shortcut of usingRecursiveFieldByFieldElementComparator(RecursiveComparisonConfiguration) with a configuration ignoring the given fields, the previous example can be written as: 

       RecursiveComparisonConfiguration configuration = RecursiveComparisonConfiguration.builder()
                                                                                  .withIgnoredFields("name.first", "nickname.last")
                                                                                  .build();

 assertThat(list(derrickRose)).usingRecursiveFieldByFieldElementComparator(configuration)
                              .contains(jalenRose);
      The recursive comparison is documented here: https://assertj.github.io/doc/#assertj-core-recursive-comparison

      Parameters:
      fields - the field names to exclude in the elements comparison.
      Returns:
      this assertion object.
      Since:
      3.20.0
      See Also:

    • inHexadecimal

      public SELF inHexadecimal()
      Enable hexadecimal representation of Iterable elements instead of standard representation in error messages.

      It can be useful to better understand what the error was with a more meaningful error message.

      Example 

       final List<Byte> bytes = newArrayList((byte) 0x10, (byte) 0x20);
      With standard error message: 
       assertThat(bytes).contains((byte) 0x30);

 Expecting:
  <[16, 32]>
 to contain:
  <[48]>
 but could not find:
  <[48]>
      With Hexadecimal error message: 
       assertThat(bytes).inHexadecimal().contains((byte) 0x30);

 Expecting:
  <[0x10, 0x20]>
 to contain:
  <[0x30]>
 but could not find:
  <[0x30]>
      Overrides:
      inHexadecimal in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • inBinary

      public SELF inBinary()
      Enable binary representation of Iterable elements instead of standard representation in error messages.

      Example: 

       final List<Byte> bytes = newArrayList((byte) 0x10, (byte) 0x20);
      With standard error message: 
       assertThat(bytes).contains((byte) 0x30);

 Expecting:
  <[16, 32]>
 to contain:
  <[48]>
 but could not find:
  <[48]>
      With binary error message: 
       assertThat(bytes).inBinary().contains((byte) 0x30);

 Expecting:
  <[0b00010000, 0b00100000]>
 to contain:
  <[0b00110000]>
 but could not find:
  <[0b00110000]>
      Overrides:
      inBinary in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • filteredOn

      public SELF filteredOn(String propertyOrFieldName, Object expectedValue)
      Filters the iterable under test keeping only elements having a property or field equal to expectedValue, the property/field is specified by propertyOrFieldName parameter.

      The filter first tries to get the value from a property (named propertyOrFieldName), if no such property exists it tries to read the value from a field. Reading private fields is supported by default, this can be globally disabled by calling Assertions.setAllowExtractingPrivateFields(false).

      When reading nested property/field, if an intermediate value is null the whole nested property/field is considered to be null, thus reading "address.street.name" value will return null if "street" value is null.

      As an example, let's check all employees 800 years old (yes, special employees): 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);
 Employee noname = new Employee(4L, null, 50);

 List<Employee> employees = newArrayList(yoda, luke, obiwan, noname);

 assertThat(employees).filteredOn("age", 800)
                      .containsOnly(yoda, obiwan);
      Nested properties/fields are supported: 
       // Name is bean class with 'first' and 'last' String properties

 // name is null for noname => it does not match the filter on "name.first"
 assertThat(employees).filteredOn("name.first", "Luke")
                      .containsOnly(luke);

 assertThat(employees).filteredOn("name.last", "Vader")
                      .isEmpty();

      If you want to filter on null value, use filteredOnNull(String) as Java will resolve the call to filteredOn(String, FilterOperator) instead of this method.

      An IntrospectionError is thrown if the given propertyOrFieldName can't be found in one of the iterable elements.

      You can chain filters: 

       // fellowshipOfTheRing is a list of TolkienCharacter having race and name fields
 // 'not' filter is statically imported from Assertions.not

 assertThat(fellowshipOfTheRing).filteredOn("race.name", "Man")
                                .filteredOn("name", not("Boromir"))
                                .containsOnly(aragorn);
      If you need more complex filter, use filteredOn(Predicate) or filteredOn(Condition).
      Parameters:
      propertyOrFieldName - the name of the property or field to read
      expectedValue - the value to compare element's property or field with
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given propertyOrFieldName is null or empty.
      IntrospectionError - if the given propertyOrFieldName can't be found in one of the iterable elements.

    • filteredOnNull

      public SELF filteredOnNull(String propertyOrFieldName)
      Filters the iterable under test keeping only elements whose property or field specified by propertyOrFieldName is null.

      The filter first tries to get the value from a property (named propertyOrFieldName), if no such property exists it tries to read the value from a field. Reading private fields is supported by default, this can be globally disabled by calling Assertions.setAllowExtractingPrivateFields(false).

      When reading nested property/field, if an intermediate value is null the whole nested property/field is considered to be null, thus reading "address.street.name" value will return null if "street" value is null.

      As an example, let's check all employees 800 years old (yes, special employees): 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);
 Employee noname = new Employee(4L, null, 50);

 List<Employee> employees = newArrayList(yoda, luke, obiwan, noname);

 assertThat(employees).filteredOnNull("name")
                      .containsOnly(noname);
      Nested properties/fields are supported: 
       // Name is bean class with 'first' and 'last' String properties

 assertThat(employees).filteredOnNull("name.last")
                      .containsOnly(yoda, obiwan, noname);
      An IntrospectionError is thrown if the given propertyOrFieldName can't be found in one of the iterable elements.

      If you need more complex filter, use filteredOn(Predicate) or filteredOn(Condition).

      Parameters:
      propertyOrFieldName - the name of the property or field to read
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IntrospectionError - if the given propertyOrFieldName can't be found in one of the iterable elements.

    • filteredOn

      public SELF filteredOn(String propertyOrFieldName, FilterOperator<?> filterOperator)
      Filters the iterable under test keeping only elements having a property or field matching the filter expressed with the FilterOperator, the property/field is specified by propertyOrFieldName parameter.

      The existing filters are:

      Whatever filter is applied, it first tries to get the value from a property (named propertyOrFieldName), if no such property exists it tries to read the value from a field. Reading private fields is supported by default, this can be globally disabled by calling Assertions.setAllowExtractingPrivateFields(false).

      When reading nested property/field, if an intermediate value is null the whole nested property/field is considered to be null, thus reading "address.street.name" value will return null if "street" value is null.

      As an example, let's check stuff on some special employees: 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);

 List<Employee> employees = newArrayList(yoda, luke, obiwan, noname);

 // 'not' filter is statically imported from Assertions.not
 assertThat(employees).filteredOn("age", not(800))
                      .containsOnly(luke);

 // 'in' filter is statically imported from Assertions.in
 // Name is bean class with 'first' and 'last' String properties
 assertThat(employees).filteredOn("name.first", in("Yoda", "Luke"))
                      .containsOnly(yoda, luke);

 // 'notIn' filter is statically imported from Assertions.notIn
 assertThat(employees).filteredOn("name.first", notIn("Yoda", "Luke"))
                      .containsOnly(obiwan);
      An IntrospectionError is thrown if the given propertyOrFieldName can't be found in one of the iterable elements.

      Note that combining filter operators is not supported, thus the following code is not correct: 

       // Combining filter operators like not(in(800)) is NOT supported
 // -> throws UnsupportedOperationException
 assertThat(employees).filteredOn("age", not(in(800)))
                      .contains(luke);

      You can chain filters: 

       // fellowshipOfTheRing is a list of TolkienCharacter having race and name fields
 // 'not' filter is statically imported from Assertions.not

 assertThat(fellowshipOfTheRing).filteredOn("race.name", "Man")
                                .filteredOn("name", not("Boromir"))
                                .containsOnly(aragorn);
      If you need more complex filter, use filteredOn(Predicate) or filteredOn(Condition).
      Parameters:
      propertyOrFieldName - the name of the property or field to read
      filterOperator - the filter operator to apply
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given propertyOrFieldName is null or empty.

    • filteredOn

      public SELF filteredOn(Condition<? super ELEMENT> condition)
      Filters the iterable under test keeping only elements matching the given Condition.

      If you prefer Predicate over Condition, use filteredOn(Predicate).

      Example: check old employees whose age > 100: 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);
 Employee noname = new Employee(4L, null, 50);

 List<Employee> employees = newArrayList(yoda, luke, obiwan, noname);

 // old employee condition, "old employees" describes the condition in error message
 // you just have to implement 'matches' method
 Condition<Employee> oldEmployees = new Condition<Employee>("old employees") {
       @Override
       public boolean matches(Employee employee) {
         return employee.getAge() > 100;
       }
     };
   }
 assertThat(employees).filteredOn(oldEmployees)
                      .containsOnly(yoda, obiwan);
      You can combine Condition with condition operator like Not: 
       // 'not' filter is statically imported from Assertions.not
 assertThat(employees).filteredOn(not(oldEmployees))
                      .contains(luke, noname);
      Parameters:
      condition - the filter condition / predicate
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given condition is null.

    • filteredOn

      public <T> SELF filteredOn(Function<? super ELEMENT,T> function, T expectedValue)
      Filters the iterable under test keeping only elements for which the result of the function is equal to expectedValue.

      It allows to filter elements more safely than by using filteredOn(String, Object) as it doesn't utilize introspection.

      As an example, let's check all employees 800 years old (yes, special employees): 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);
 Employee noname = new Employee(4L, null, 50);

 List<Employee> employees = newArrayList(yoda, luke, obiwan, noname);

 assertThat(employees).filteredOn(Employee::getAge, 800)
                      .containsOnly(yoda, obiwan);

 assertThat(employees).filteredOn(e -> e.getName(), null)
                      .containsOnly(noname);
      If you need more complex filter, use filteredOn(Predicate) or filteredOn(Condition).
      Type Parameters:
      T - result type of the filter function
      Parameters:
      function - the filter function
      expectedValue - the expected value of the filter function
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given function is null.
      Since:
      3.17.0

    • filteredOnAssertions

      public SELF filteredOnAssertions(Consumer<? super ELEMENT> elementAssertions)
      Filters the iterable under test keeping only elements matching the given assertions specified with a Consumer.

      Example: check young hobbits whose age < 34: 

       TolkienCharacter pippin = new TolkienCharacter("Pippin", 28, HOBBIT);
 TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter merry = new TolkienCharacter("Merry", 36, HOBBIT);
 TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);

 List<TolkienCharacter> hobbits = list(frodo, sam, merry, pippin);

 assertThat(hobbits).filteredOnAssertions(hobbit -> assertThat(hobbit.age).isLessThan(34))
                    .containsOnly(frodo, pippin);
      Parameters:
      elementAssertions - containing AssertJ assertions to filter on
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given Consumer is null.
      Since:
      3.11.0

    • filteredOnAssertions

      public SELF filteredOnAssertions(ThrowingConsumer<? super ELEMENT> elementAssertions)
      Filters the iterable under test keeping only elements matching the given assertions specified with a ThrowingConsumer.

      This is the same assertion as filteredOnAssertions(Consumer) but the given consumer can throw checked exceptions.
      More precisely, RuntimeException and AssertionError are rethrown as they are and Throwable wrapped in a RuntimeException.

      Example: check young hobbits whose age < 34: 

       TolkienCharacter pippin = new TolkienCharacter("Pippin", 28, HOBBIT);
 TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter merry = new TolkienCharacter("Merry", 36, HOBBIT);
 TolkienCharacter sam = new TolkienCharacter("Sam", 38, HOBBIT);

 List<TolkienCharacter> hobbits = list(frodo, sam, merry, pippin);

 // the code would compile even if getAge() threw a checked exception
 assertThat(hobbits).filteredOnAssertions(hobbit -> assertThat(hobbit.getAge()).isLessThan(34))
                    .containsOnly(frodo, pippin);
      Parameters:
      elementAssertions - containing AssertJ assertions to filter on
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given ThrowingConsumer is null.
      Since:
      3.21.0

    • first

      public ELEMENT_ASSERT first()
      Navigate and allow to perform assertions on the first element of the Iterable under test.

      By default available assertions after first() are Object assertions, it is possible though to get more specific assertions if you create IterableAssert with either:

      Example: default Object assertions 

       // default iterable assert => element assert is ObjectAssert
 Iterable<TolkienCharacter> hobbits = newArrayList(frodo, sam, pippin);

 // assertion succeeds, only Object assertions are available after first()
 assertThat(hobbits).first()
                    .isEqualTo(frodo);

 // assertion fails
 assertThat(hobbits).first()
                    .isEqualTo(pippin);

      If you have created the Iterable assertion using an AssertFactory or the element assert class, you will be able to chain first() with more specific typed assertion.

      Example: use of String assertions after first() 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 // String assertions are available after first()
 assertThat(hobbits, StringAssert.class).first()
                                        .startsWith("Fro")
                                        .endsWith("do");
 // assertion fails
 assertThat(hobbits, StringAssert.class).first()
                                        .startsWith("Pip");
      Returns:
      the assertion on the first element
      Throws:
      AssertionError - if the actual Iterable is empty.
      Since:
      2.5.0 / 3.5.0
      See Also:

    • first

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT first(InstanceOfAssertFactory<?,ASSERT> assertFactory)
      Navigate and allow to perform assertions on the first element of the Iterable under test.

      The assertFactory parameter allows to specify an InstanceOfAssertFactory, which is used to get the assertions narrowed to the factory type.

      Example: use of String assertions after first(as(InstanceOfAssertFactories.STRING) 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 assertThat(hobbits).first(as(InstanceOfAssertFactories.STRING))
                    .startsWith("Fro")
                    .endsWith("do");
 // assertion fails
 assertThat(hobbits).first(as(InstanceOfAssertFactories.STRING))
                    .startsWith("Pip");
 // assertion fails because of wrong factory type
 assertThat(hobbits).first(as(InstanceOfAssertFactories.INTEGER))
                    .isZero();
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      assertFactory - the factory which verifies the type and creates the new Assert
      Returns:
      a new narrowed Assert instance for assertions chaining on the first element
      Throws:
      AssertionError - if the actual Iterable is empty.
      NullPointerException - if the given factory is null
      Since:
      3.14.0

    • last

      public ELEMENT_ASSERT last()
      Navigate and allow to perform assertions on the last element of the Iterable under test.

      By default available assertions after last() are Object assertions, it is possible though to get more specific assertions if you create IterableAssert with either:

      Example: default Object assertions 

       // default iterable assert => element assert is ObjectAssert
 Iterable<TolkienCharacter> hobbits = newArrayList(frodo, sam, pippin);

 // assertion succeeds, only Object assertions are available after last()
 assertThat(hobbits).last()
                    .isEqualTo(pippin);

 // assertion fails
 assertThat(hobbits).last()
                    .isEqualTo(frodo);

      If you have created the Iterable assertion using an AssertFactory or the element assert class, you will be able to chain last() with more specific typed assertion.

      Example: use of String assertions after last() 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 // String assertions are available after last()
 assertThat(hobbits, StringAssert.class).last()
                                        .startsWith("Pi")
                                        .endsWith("in");
 // assertion fails
 assertThat(hobbits, StringAssert.class).last()
                                        .startsWith("Fro");
      Returns:
      the assertion on the last element
      Throws:
      AssertionError - if the actual Iterable is empty.
      Since:
      2.5.0 / 3.5.0
      See Also:

    • last

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT last(InstanceOfAssertFactory<?,ASSERT> assertFactory)
      Navigate and allow to perform assertions on the last element of the Iterable under test.

      The assertFactory parameter allows to specify an InstanceOfAssertFactory, which is used to get the assertions narrowed to the factory type.

      Example: use of String assertions after last(as(InstanceOfAssertFactories.STRING) 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 assertThat(hobbits).last(as(InstanceOfAssertFactories.STRING))
                    .startsWith("Pip")
                    .endsWith("pin");
 // assertion fails
 assertThat(hobbits).last(as(InstanceOfAssertFactories.STRING))
                    .startsWith("Fro");
 // assertion fails because of wrong factory type
 assertThat(hobbits).last(as(InstanceOfAssertFactories.INTEGER))
                    .isZero();
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      assertFactory - the factory which verifies the type and creates the new Assert
      Returns:
      a new narrowed Assert instance for assertions chaining on the last element
      Throws:
      AssertionError - if the actual Iterable is empty.
      NullPointerException - if the given factory is null
      Since:
      3.14.0

    • element

      public ELEMENT_ASSERT element(int index)
      Navigate and allow to perform assertions on the chosen element of the Iterable under test.

      By default available assertions after element(index) are Object assertions, it is possible though to get more specific assertions if you create IterableAssert with either:

      Example: default Object assertions 

       // default iterable assert => element assert is ObjectAssert
 Iterable<TolkienCharacter> hobbits = newArrayList(frodo, sam, pippin);

 // assertion succeeds, only Object assertions are available after element(index)
 assertThat(hobbits).element(1)
                    .isEqualTo(sam);

 // assertion fails
 assertThat(hobbits).element(1)
                    .isEqualTo(pippin);

      If you have created the Iterable assertion using an AssertFactory or the element assert class, you will be able to chain element(index) with more specific typed assertion.

      Example: use of String assertions after element(index) 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 // String assertions are available after element(index)
 assertThat(hobbits, StringAssert.class).element(1)
                                        .startsWith("Sa")
                                        .endsWith("am");
 // assertion fails
 assertThat(hobbits, StringAssert.class).element(1)
                                        .startsWith("Fro");
      Parameters:
      index - the element's index
      Returns:
      the assertion on the given element
      Throws:
      AssertionError - if the given index is out of bound.
      Since:
      2.5.0 / 3.5.0
      See Also:

    • elements

      public SELF elements(int... indices)
      Allow to perform assertions on the elements corresponding to the given indices (the iterable Iterable under test is changed to an iterable with the selected elements).

      Example: 

       Iterable<TolkienCharacter> hobbits = newArrayList(frodo, sam, pippin);

 // assertion succeeds
 assertThat(hobbits).elements(1, 2)
                    .hasSize(2)
                    .containsExactly(sam, pippin);

 // assertion fails
 assertThat(hobbits).element(1, 2)
                    .containsExactly(frodo, pippin);

      Parameters:
      indices - the elements indices
      Returns:
      the assertion on the given elements
      Throws:
      IllegalArgumentException - if indices array is null or empty
      AssertionError - if one of the given indices is out of bound or if the actual is empty
      Since:
      3.20

    • newAbstractIterableAssertForProxy

      protected SELF newAbstractIterableAssertForProxy(List<ELEMENT> filteredIterable)

    • element

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT element(int index, InstanceOfAssertFactory<?,ASSERT> assertFactory)
      Navigate and allow to perform assertions on the chosen element of the Iterable under test.

      The assertFactory parameter allows to specify an InstanceOfAssertFactory, which is used to get the assertions narrowed to the factory type.

      Example: use of String assertions after element(index, as(InstanceOfAssertFactories.STRING) 

       Iterable<String> hobbits = newArrayList("Frodo", "Sam", "Pippin");

 // assertion succeeds
 assertThat(hobbits).element(1, as(InstanceOfAssertFactories.STRING))
                    .startsWith("Sa")
                    .endsWith("am");
 // assertion fails
 assertThat(hobbits).element(1, as(InstanceOfAssertFactories.STRING))
                    .startsWith("Fro");
 // assertion fails because of wrong factory type
 assertThat(hobbits).element(1, as(InstanceOfAssertFactories.INTEGER))
                    .isZero();
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      index - the element's index
      assertFactory - the factory which verifies the type and creates the new Assert
      Returns:
      a new narrowed Assert instance for assertions chaining on the element at the given index
      Throws:
      AssertionError - if the given index is out of bound.
      NullPointerException - if the given factory is null
      Since:
      3.14.0

    • singleElement

      public ELEMENT_ASSERT singleElement()
      Verifies that the Iterable under test contains a single element and allows to perform assertions on that element.

      This is a shorthand for hasSize(1).first().

      By default available assertions after singleElement() are Object assertions, it is possible though to get more specific assertions if you create IterableAssert with either:

      Example: 

       List<String> babySimpsons = list("Maggie");

 // assertion succeeds, only Object assertions are available after singleElement()
 assertThat(babySimpsons).singleElement()
                         .isEqualTo("Maggie");

 // assertion fails
 assertThat(babySimpsons).singleElement()
                         .isEqualTo("Homer");

 // assertion fails because list contains no elements
 assertThat(emptyList()).singleElement();


 // assertion fails because list contains more than one element
 List<String> simpsons = list("Homer", "Marge", "Lisa", "Bart", "Maggie");
 assertThat(simpsons).singleElement();

      If you have created the Iterable assertion using an AssertFactory or the element assert class, you will be able to chain singleElement() with more specific typed assertion.

      Example: use of String assertions after singleElement() 

       List<String> babySimpsons = list("Maggie");

 // assertion succeeds
 // String assertions are available after singleElement()
 assertThat(babySimpsons, StringAssert.class).singleElement()
                                             .startsWith("Mag");

 // InstanceOfAssertFactories.STRING is an AssertFactory for String assertions
 assertThat(babySimpsons, InstanceOfAssertFactories.STRING).singleElement()
                                                           .startsWith("Mag");
 // better readability with import static InstanceOfAssertFactories.STRING and Assertions.as
 assertThat(babySimpsons, as(STRING)).singleElement()
                                     .startsWith("Mag");

 // assertions fail
 assertThat(babySimpsons, StringAssert.class).singleElement()
                                             .startsWith("Lis");
 // failure as the single element is not an int/Integer
 assertThat(babySimpsons, IntegerAssert.class).singleElement()
                                              .startsWith("Lis");
      Returns:
      the assertion on the first element
      Throws:
      AssertionError - if the actual Iterable does not contain exactly one element.
      Since:
      3.17.0
      See Also:

    • singleElement

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT singleElement(InstanceOfAssertFactory<?,ASSERT> assertFactory)
      Verifies that the Iterable under test contains a single element and allows to perform assertions on that element, the assertions are strongly typed according to the given AssertFactory parameter.

      This is a shorthand for hasSize(1).first(assertFactory).

      Example: use of String assertions after singleElement(as(STRING)) 

       import static org.assertj.core.api.InstanceOfAssertFactories.STRING;
 import static org.assertj.core.api.InstanceOfAssertFactories.INTEGER;
 import static org.assertj.core.api.Assertions.as; // syntactic sugar

 List<String> babySimpsons = list("Maggie");

 // assertion succeeds
 assertThat(babySimpsons).singleElement(as(STRING))
                         .startsWith("Mag");

 // assertion fails
 assertThat(babySimpsons).singleElement(as(STRING))
                         .startsWith("Lis");

 // assertion fails because of wrong factory type
 assertThat(babySimpsons).singleElement(as(INTEGER))
                         .isZero();

 // assertion fails because list contains no elements
 assertThat(emptyList()).singleElement(as(STRING));

 // assertion fails because list contains more than one element
 List<String> simpsons = list("Homer", "Marge", "Lisa", "Bart", "Maggie");
 assertThat(simpsons).singleElement(as(STRING));
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      assertFactory - the factory which verifies the type and creates the new Assert
      Returns:
      a new narrowed Assert instance for assertions chaining on the single element
      Throws:
      AssertionError - if the actual Iterable does not contain exactly one element.
      NullPointerException - if the given factory is null.
      Since:
      3.17.0

    • toAssert

      protected abstract ELEMENT_ASSERT toAssert(ELEMENT value, String description)
      This method is used in navigating assertions like first(), last() and element(int) to build the assertion for the given element navigated to.

      Typical implementation is returning an ObjectAssert but it is possible to return a more specialized assertions should you know what type of elements the iterables contain.

      Parameters:
      value - the element value
      description - describes the element, ex: "check first element" for first(), used in assertion description.
      Returns:
      the assertion for the given element

    • filteredOn

      public SELF filteredOn(Predicate<? super ELEMENT> predicate)
      Filters the iterable under test keeping only elements matching the given Predicate.

      Example: check old employees whose age > 100: 

       Employee yoda   = new Employee(1L, new Name("Yoda"), 800);
 Employee obiwan = new Employee(2L, new Name("Obiwan"), 800);
 Employee luke   = new Employee(3L, new Name("Luke", "Skywalker"), 26);

 List<Employee> employees = newArrayList(yoda, luke, obiwan);

 assertThat(employees).filteredOn(employee -> employee.getAge() > 100)
                      .containsOnly(yoda, obiwan);
      Parameters:
      predicate - the filter predicate
      Returns:
      a new assertion object with the filtered iterable under test
      Throws:
      IllegalArgumentException - if the given predicate is null.

    • allMatch

      public SELF allMatch(Predicate<? super ELEMENT> predicate)
      Verifies that all the elements of actual match the given Predicate.

      Example : 

       Iterable<String> abc  = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 // assertion will pass
 assertThat(abc).allMatch(s -> s.length() == 1);

 // assertion will fail
 assertThat(abcc).allMatch(s -> s.length() == 1);
      Note that you can achieve the same result with are(Condition) or have(Condition).
      Specified by:
      allMatch in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      predicate - the given Predicate.
      Returns:
      this object.

    • allMatch

      public SELF allMatch(Predicate<? super ELEMENT> predicate, String predicateDescription)
      Verifies that all the elements of actual match the given Predicate. The predicate description is used to get an informative error message.

      Example : 

       Iterable<String> abc = newArrayList("a", "b", "c");
 Iterable<String> abcc = newArrayList("a", "b", "cc");

 // assertion will pass
 assertThat(abc).allMatch(s -> s.length() == 1, "length of 1");

 // assertion will fail
 assertThat(abcc).allMatch(s -> s.length() == 1, "length of 1");
      The message of the failed assertion would be: 
      Expecting all elements of:
  <["a", "b", "cc"]>
  to match 'length of 1' predicate but this element did not:
  <"cc">
      Specified by:
      allMatch in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      predicate - the given Predicate.
      predicateDescription - a description of the Predicate used in the error message
      Returns:
      this object.

    • allSatisfy

      public SELF allSatisfy(Consumer<? super ELEMENT> requirements)
      Verifies that all the elements satisfy the given requirements expressed as a Consumer.

      This is useful to perform a group of assertions on elements.

      Example: 

       assertThat(myIcelanderFriends).allSatisfy(person -> {
                                 assertThat(person.getCountry()).isEqualTo("Iceland");
                                 assertThat(person.getPhoneCountryCode()).isEqualTo("+354");
                               });

      If the actual iterable is empty, this assertion succeeds as there is no elements to check.

      Specified by:
      allSatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the given Consumer.
      Returns:
      this object.

    • allSatisfy

      public SELF allSatisfy(ThrowingConsumer<? super ELEMENT> requirements)
      Verifies that all the elements satisfy the given requirements expressed as a ThrowingConsumer.

      This is useful to perform a group of assertions on elements.

      This is the same assertion as ObjectEnumerableAssert.allSatisfy(Consumer) but the given consumer can throw checked exceptions.
      More precisely, RuntimeException and AssertionError are rethrown as they are and Throwable wrapped in a RuntimeException.

      Example: 

        // read() throws IOException
 // note that the code would not compile if isNotEmpty, startsWithA or startsWithZ were declared as a Consumer<Reader> 
 ThrowingConsumer<Reader> isNotEmpty = reader -> assertThat(reader.read()).isEqualTo(-1);
 ThrowingConsumer<Reader> startsWithA = reader -> assertThat(reader.read()).isEqualTo('A');

 // ABC.txt contains: ABC  
 // XYZ.txt contains: XYZ  
 Iterable<FileReader> fileReaders = Arrays.asList(new FileReader("ABC.txt"), new FileReader("XYZ.txt"));
 
 // assertion succeeds as none of the files are empty
 assertThat(fileReaders).allSatisfy(isNotEmpty);

 // assertion fails as XYZ.txt does not start with 'A':
 assertThat(fileReaders).allSatisfy(startsWithA);

      If the actual iterable is empty, this assertion succeeds as there is nothing to check.

      Specified by:
      allSatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the given ThrowingConsumer.
      Returns:
      this object.

    • anyMatch

      public SELF anyMatch(Predicate<? super ELEMENT> predicate)
      Verifies whether any elements match the provided Predicate.

      Example : 

       Iterable<String> abcc = newArrayList("a", "b", "cc");

 // assertion will pass
 assertThat(abcc).anyMatch(s -> s.length() == 2);

 // assertion will fail
 assertThat(abcc).anyMatch(s -> s.length() > 2);
      Note that you can achieve the same result with areAtLeastOne(Condition) or haveAtLeastOne(Condition).
      Specified by:
      anyMatch in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      predicate - the given Predicate.
      Returns:
      this object.

    • zipSatisfy

      public <OTHER_ELEMENT> SELF zipSatisfy(Iterable<OTHER_ELEMENT> other, BiConsumer<? super ELEMENT,OTHER_ELEMENT> zipRequirements)
      Verifies that the zipped pairs of actual and other elements, i.e: (actual 1st element, other 1st element), (actual 2nd element, other 2nd element), ... all satisfy the given zipRequirements.

      This assertion assumes that actual and other have the same size but they can contain different type of elements making it handy to compare objects converted to another type, for example Domain and View/DTO objects.

      Example: 

       List<Adress> addressModels = findGoodRestaurants();
 List<AdressView> addressViews = convertToView(addressModels);

 // compare addressViews and addressModels respective paired elements.
 assertThat(addressViews).zipSatisfy(addressModels, (AdressView view, Adress model) -> {
    assertThat(view.getZipcode() + ' ' + view.getCity()).isEqualTo(model.getCityLine());
    assertThat(view.getStreet()).isEqualTo(model.getStreet().toUpperCase());
 });
      Type Parameters:
      OTHER_ELEMENT - the type of the other iterable elements.
      Parameters:
      other - the iterable to zip actual with.
      zipRequirements - the given requirements that each pair must satisfy.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the given zipRequirements BiConsumer is null.
      NullPointerException - if the other iterable to zip actual with is null.
      AssertionError - if the Iterable under test is null.
      AssertionError - if actual and other don't have the same size.
      AssertionError - if one or more pairs don't satisfy the given requirements.
      Since:
      3.9.0

    • anySatisfy

      public SELF anySatisfy(Consumer<? super ELEMENT> requirements)
      Verifies that at least one element satisfies the given requirements expressed as a Consumer.

      This is useful to check that a group of assertions is verified by (at least) one element.

      If the group of elements to assert is empty, the assertion will fail.

      Example: 

       // assume that one icelander in myIcelanderFriends has a name finishing by 'son'
 assertThat(myIcelanderFriends).anySatisfy(person -> {
                                  assertThat(person.getCountry()).isEqualTo("Iceland");
                                  assertThat(person.getSurname()).endsWith("son");
                                });

 // assertion fails for empty group, whatever the requirements are.
 assertThat(emptyGroup).anySatisfy($ -> assertThat(true).isTrue());
      Specified by:
      anySatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the given Consumer.
      Returns:
      this object.

    • anySatisfy

      public SELF anySatisfy(ThrowingConsumer<? super ELEMENT> requirements)
      Verifies that at least one element satisfies the given requirements expressed as a ThrowingConsumer.

      This is useful to check that a group of assertions is verified by (at least) one element.

      This is the same assertion as ObjectEnumerableAssert.anySatisfy(Consumer) but the given consumer can throw checked exceptions.
      More precisely, RuntimeException and AssertionError are rethrown as they are and Throwable wrapped in a RuntimeException.

      Example: 

        // read() throws IOException
 // note that the code would not compile if startsWithA, startsWithY or startsWithZ were declared as a Consumer<Reader> 
 ThrowingConsumer<Reader> startsWithA = reader -> assertThat(reader.read()).isEqualTo('A');
 ThrowingConsumer<Reader> startsWithZ = reader -> assertThat(reader.read()).isEqualTo('Z');

 // ABC.txt contains: ABC  
 // XYZ.txt contains: XYZ  
 Iterable<FileReader> fileReaders = Arrays.asList(new FileReader("ABC.txt"), new FileReader("XYZ.txt"));
 
 // assertion succeeds as ABC.txt starts with 'A'
 assertThat(fileReaders).anySatisfy(startsWithA);

 // assertion fails none of the files starts with 'Z':
 assertThat(fileReaders).anySatisfy(startsWithZ);

      If the actual iterable is empty, this assertion succeeds as there is nothing to check.

      Specified by:
      anySatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the given ThrowingConsumer.
      Returns:
      this object.

    • noneSatisfy

      public SELF noneSatisfy(Consumer<? super ELEMENT> restrictions)
      Verifies that no elements satisfy the given restrictions expressed as a Consumer.

      Example: 

       // assume that all icelander in myIcelanderFriends are not from Brazil
 assertThat(myIcelanderFriends).noneSatisfy(person -> {
                                  assertThat(person.getCountry()).isEqualTo("Brazil");
                                });
      Note that this assertion succeeds if the group (collection, array, ...) is empty whatever the restrictions are.
      Specified by:
      noneSatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      restrictions - the given restrictions as Consumer that no elements should met.
      Returns:
      this object.

    • noneSatisfy

      public SELF noneSatisfy(ThrowingConsumer<? super ELEMENT> restrictions)
      Verifies that no elements satisfy the given restrictions expressed as a Consumer.

      This is useful to check that a group of assertions is verified by (at least) one element.

      This is the same assertion as ObjectEnumerableAssert.anySatisfy(Consumer) but the given consumer can throw checked exceptions.
      More precisely, RuntimeException and AssertionError are rethrown as they are and Throwable wrapped in a RuntimeException.

      Example: 

        // read() throws IOException
 // note that the code would not compile if startsWithA, startsWithY or startsWithZ were declared as a Consumer<Reader> 
 ThrowingConsumer<Reader> startsWithA = reader -> assertThat(reader.read()).isEqualTo('A');
 ThrowingConsumer<Reader> startsWithZ = reader -> assertThat(reader.read()).isEqualTo('Z');

 // ABC.txt contains: ABC  
 // XYZ.txt contains: XYZ  
 Iterable<FileReader> fileReaders = Arrays.asList(new FileReader("ABC.txt"), new FileReader("XYZ.txt"));
 
 // assertion succeeds as none of the file starts 'Z'
 assertThat(fileReaders).noneSatisfy(startsWithZ);

 // assertion fails as ABC.txt starts with 'A':
 assertThat(fileReaders).noneSatisfy(startsWithA);

      Note that this assertion succeeds if the group (collection, array, ...) is empty whatever the restrictions are.

      Specified by:
      noneSatisfy in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      restrictions - the given ThrowingConsumer.
      Returns:
      this object.

    • satisfiesExactly

      @SafeVarargs public final SELF satisfiesExactly(Consumer<? super ELEMENT>... requirements)
      Verifies that each element satisfies the requirements corresponding to its index, so the first element must satisfy the first requirements, the second element the second requirements etc...

      Each requirements are expressed as a Consumer, there must be as many requirements as there are iterable elements.

      Example: 

       Iterable<TolkienCharacter> characters = list(frodo, aragorn, legolas);

 // assertions succeed
 assertThat(characters).satisfiesExactly(character -> assertThat(character.getRace()).isEqualTo("Hobbit"),
                                         character -> assertThat(character.isMortal()).isTrue(),
                                         character -> assertThat(character.getName()).isEqualTo("Legolas"));

 // you can specify more than one assertion per requirement
 assertThat(characters).satisfiesExactly(character -> {
                                            assertThat(character.getRace()).isEqualTo("Hobbit");
                                            assertThat(character.getName()).isEqualTo("Frodo");
                                         },
                                         character -> {
                                            assertThat(character.isMortal()).isTrue();
                                            assertThat(character.getName()).isEqualTo("Aragorn");
                                         },
                                         character -> {
                                            assertThat(character.getRace()).isEqualTo("Elf");
                                            assertThat(character.getName()).isEqualTo("Legolas");
                                         });

 // assertion fails as aragorn does not meet the second requirements
 assertThat(characters).satisfiesExactly(character -> assertThat(character.getRace()).isEqualTo("Hobbit"),
                                         character -> assertThat(character.isMortal()).isFalse(),
                                         character -> assertThat(character.getName()).isEqualTo("Legolas"));
      Specified by:
      satisfiesExactly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the requirements to meet.
      Returns:
      this to chain assertions.

    • satisfiesExactly

      @SafeVarargs public final SELF satisfiesExactly(ThrowingConsumer<? super ELEMENT>... requirements)
      Verifies that each element satisfies the requirements corresponding to its index, so the first element must satisfy the first requirements, the second element the second requirements etc...

      Each requirements are expressed as a ThrowingConsumer, there must be as many requirements as there are iterable elements.

      This is the same assertion as ObjectEnumerableAssert.satisfiesExactly(Consumer...) but the given consumers can throw checked exceptions.
      More precisely, RuntimeException and AssertionError are rethrown as they are and Throwable wrapped in a RuntimeException.

      Example: 

       Iterable<TolkienCharacter> characters = list(frodo, aragorn, legolas);
 
 // the code would compile even if TolkienCharacter.getRace(), isMortal() or getName() threw a checked exception

 // assertions succeed
 assertThat(characters).satisfiesExactly(character -> assertThat(character.getRace()).isEqualTo("Hobbit"),
                                         character -> assertThat(character.isMortal()).isTrue(),
                                         character -> assertThat(character.getName()).isEqualTo("Legolas"));

 // you can specify more than one assertion per requirement
 assertThat(characters).satisfiesExactly(character -> {
                                            assertThat(character.getRace()).isEqualTo("Hobbit");
                                            assertThat(character.getName()).isEqualTo("Frodo");
                                         },
                                         character -> {
                                            assertThat(character.isMortal()).isTrue();
                                            assertThat(character.getName()).isEqualTo("Aragorn");
                                         },
                                         character -> {
                                            assertThat(character.getRace()).isEqualTo("Elf");
                                            assertThat(character.getName()).isEqualTo("Legolas");
                                         });

 // assertion fails as aragorn does not meet the second requirements
 assertThat(characters).satisfiesExactly(character -> assertThat(character.getRace()).isEqualTo("Hobbit"),
                                         character -> assertThat(character.isMortal()).isFalse(),
                                         character -> assertThat(character.getName()).isEqualTo("Legolas"));
      Specified by:
      satisfiesExactly in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the requirements to meet.
      Returns:
      this to chain assertions.

    • satisfiesExactlyForProxy

      protected SELF satisfiesExactlyForProxy(Consumer<? super ELEMENT>[] requirements)

    • satisfiesExactlyInAnyOrder

      @SafeVarargs public final SELF satisfiesExactlyInAnyOrder(Consumer<? super ELEMENT>... requirements)
      Verifies that at least one combination of iterable elements exists that satisfies the consumers in order (there must be as many consumers as iterable elements and once a consumer is matched it cannot be reused to match other elements).

      This is a variation of ObjectEnumerableAssert.satisfiesExactly(Consumer...) where order does not matter.

      Examples: 

       List<String> starWarsCharacterNames = list("Luke", "Leia", "Yoda");

 // these assertions succeed:
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"), // matches "Yoda"
                                                               name -> assertThat(name).contains("L"), // matches "Luke" and "Leia"
                                                               name -> {
                                                                 assertThat(name).hasSize(4);
                                                                 assertThat(name).doesNotContain("a"); // matches "Luke" but not "Leia"
                                                               })
                                   .satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Yo"),
                                                               name -> assertThat(name).contains("Lu"),
                                                               name -> assertThat(name).contains("Le"))
                                   .satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Le"),
                                                               name -> assertThat(name).contains("Yo"),
                                                               name -> assertThat(name).contains("Lu"));

 // this assertion fails as 3 consumer/requirements are expected
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"),
                                                               name -> assertThat(name).contains("L"));

 // this assertion fails as no element contains "Han" (first consumer/requirements can't be met)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Han"),
                                                               name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("Y"));

 // this assertion fails as "Yoda" element can't satisfy any consumers/requirements (even though all consumers/requirements are met)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("L"));

 // this assertion fails as no combination of elements can satisfy the consumers in order
 // the problem is if the last consumer is matched by Leia then no other consumer can match Luke (and vice versa)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"),
                                                               name -> assertThat(name).contains("o"),
                                                               name -> assertThat(name).contains("L"));
      Specified by:
      satisfiesExactlyInAnyOrder in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the consumers that are expected to be satisfied by the elements of the given Iterable.
      Returns:
      this assertion object.

    • satisfiesExactlyInAnyOrder

      @SafeVarargs public final SELF satisfiesExactlyInAnyOrder(ThrowingConsumer<? super ELEMENT>... requirements)
      Verifies that at least one combination of iterable elements exists that satisfies the ThrowingConsumers in order (there must be as many consumers as iterable elements and once a consumer is matched it cannot be reused to match other elements).

      This is a variation of ObjectEnumerableAssert.satisfiesExactly(ThrowingConsumer...) where order does not matter.

      Examples: 

       List<String> starWarsCharacterNames = list("Luke", "Leia", "Yoda");

 // these assertions succeed:
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"), // matches "Yoda"
                                                               name -> assertThat(name).contains("L"), // matches "Luke" and "Leia"
                                                               name -> {
                                                                 assertThat(name).hasSize(4);
                                                                 assertThat(name).doesNotContain("a"); // matches "Luke" but not "Leia"
                                                               })
                                   .satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Yo"),
                                                               name -> assertThat(name).contains("Lu"),
                                                               name -> assertThat(name).contains("Le"))
                                   .satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Le"),
                                                               name -> assertThat(name).contains("Yo"),
                                                               name -> assertThat(name).contains("Lu"));

 // this assertion fails as 3 consumers/requirements are expected
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"),
                                                               name -> assertThat(name).contains("L"));

 // this assertion fails as no element contains "Han" (first consumer/requirements can't be met)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Han"),
                                                               name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("Y"));

 // this assertion fails as "Yoda" element can't satisfy any consumers/requirements (even though all consumers/requirements are met)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("L"),
                                                               name -> assertThat(name).contains("L"));

 // this assertion fails as no combination of elements can satisfy the consumers in order
 // the problem is if the last consumer is matched by Leia then no other consumer can match Luke (and vice versa)
 assertThat(starWarsCharacterNames).satisfiesExactlyInAnyOrder(name -> assertThat(name).contains("Y"),
                                                               name -> assertThat(name).contains("o"),
                                                               name -> assertThat(name).contains("L"));
      Specified by:
      satisfiesExactlyInAnyOrder in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      requirements - the consumers that are expected to be satisfied by the elements of the given Iterable.
      Returns:
      this assertion object.

    • satisfiesExactlyInAnyOrderForProxy

      protected SELF satisfiesExactlyInAnyOrderForProxy(Consumer<? super ELEMENT>[] requirements)

    • as

      public SELF as(String description, Object... args)
      Description copied from interface: Descriptable
      Sets the description of the assertion that is going to be called after.

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      The description follows String.format(String, Object...) syntax.

      Example : 

       try {
   // set an incorrect age to Mr Frodo which is really 33 years old.
   frodo.setAge(50);
   // specify a test description (call as() before the assertion !), it supports String format syntax.
   assertThat(frodo.getAge()).as("check %s's age", frodo.getName()).isEqualTo(33);
 } catch (AssertionError e) {
   assertThat(e).hasMessage("[check Frodo's age]\n
                             expected: 33\n
                              but was: 50");
 }
      Specified by:
      as in interface Descriptable<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>>
      Parameters:
      description - the new description to set.
      args - optional parameter if description is a format String.
      Returns:
      this object.
      See Also:

    • as

      public SELF as(Description description)
      Description copied from interface: Descriptable
      Sets the description of the assertion that is going to be called after.

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      This overloaded version of "describedAs" offers more flexibility than the one taking a String by allowing users to pass their own implementation of a description. For example, a description that creates its value lazily, only when an assertion failure occurs.

      Specified by:
      as in interface Descriptable<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>>
      Parameters:
      description - the new description to set.
      Returns:
      this object.
      See Also:

    • describedAs

      public SELF describedAs(Description description)
      Description copied from class: AbstractAssert
      Sets the description of the assertion that is going to be called after.

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      This overloaded version of "describedAs" offers more flexibility than the one taking a String by allowing users to pass their own implementation of a description. For example, a description that creates its value lazily, only when an assertion failure occurs.

      Specified by:
      describedAs in interface Descriptable<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>>
      Overrides:
      describedAs in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      description - the new description to set.
      Returns:
      this object.

    • describedAs

      public SELF describedAs(String description, Object... args)
      Description copied from interface: Descriptable
      Sets the description of the assertion that is going to be called after.

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      Alias for Descriptable.as(String, Object...) since "as" is a keyword in Groovy.

      Specified by:
      describedAs in interface Descriptable<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>>
      Parameters:
      description - the new description to set.
      args - optional parameter if description is a format String.
      Returns:
      this object.

    • doesNotHave

      public SELF doesNotHave(Condition<? super ACTUAL> condition)
      Description copied from class: AbstractAssert
      Verifies that the actual value does not satisfy the given condition. This method is an alias for ExtensionPoints.isNot(Condition).
      Specified by:
      doesNotHave in interface ExtensionPoints<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      doesNotHave in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this ExtensionPoints object.
      See Also:

    • doesNotHaveSameClassAs

      public SELF doesNotHaveSameClassAs(Object other)
      Description copied from class: AbstractAssert
      Verifies that the actual value does not have the same class as the given object.

      Example: 

       // assertions succeed
 assertThat(1).doesNotHaveSameClassAs("abc");
 assertThat(new ArrayList<String>()).doesNotHaveSameClassAs(new LinkedList<String>());

 // assertions fail
 assertThat(1).doesNotHaveSameClassAs(2);
 assertThat("abc").doesNotHaveSameClassAs("123");
 assertThat(new ArrayList<String>()).doesNotHaveSameClassAs(new ArrayList<Integer>());
      Specified by:
      doesNotHaveSameClassAs in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      doesNotHaveSameClassAs in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the object to check type against.
      Returns:
      this assertion object.

    • has

      public SELF has(Condition<? super ACTUAL> condition)
      Description copied from class: AbstractAssert
      Verifies that the actual value satisfies the given condition. This method is an alias for ExtensionPoints.is(Condition) .
      Specified by:
      has in interface ExtensionPoints<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      has in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this ExtensionPoints object.
      See Also:

    • hasSameClassAs

      public SELF hasSameClassAs(Object other)
      Description copied from class: AbstractAssert
      Verifies that the actual value has the same class as the given object.

      Example: 

       // assertions succeed
 assertThat(1).hasSameClassAs(2);
 assertThat("abc").hasSameClassAs("123");
 assertThat(new ArrayList<String>()).hasSameClassAs(new ArrayList<Integer>());

 // assertions fail
 assertThat(1).hasSameClassAs("abc");
 assertThat(new ArrayList<String>()).hasSameClassAs(new LinkedList<String>());
      Specified by:
      hasSameClassAs in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      hasSameClassAs in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the object to check type against.
      Returns:
      this assertion object.

    • hasToString

      public SELF hasToString(String expectedToString)
      Description copied from class: AbstractAssert
      Verifies that actual actual.toString() is equal to the given String.

      Example : 

       CartoonCharacter homer = new CartoonCharacter("Homer");

 // Instead of writing ...
 assertThat(homer.toString()).isEqualTo("Homer");
 // ... you can simply write:
 assertThat(homer).hasToString("Homer");
      Specified by:
      hasToString in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      hasToString in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expectedToString - the expected String description of actual.
      Returns:
      this assertion object.

    • is

      public SELF is(Condition<? super ACTUAL> condition)
      Description copied from class: AbstractAssert
      Verifies that the actual value satisfies the given condition. This method is an alias for ExtensionPoints.has(Condition).
      Specified by:
      is in interface ExtensionPoints<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      is in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this ExtensionPoints object.
      See Also:

    • isEqualTo

      public SELF isEqualTo(Object expected)
      Description copied from class: AbstractAssert
      Verifies that the actual value is equal to the given one.

      Example: 

       // assertions succeed
 assertThat("abc").isEqualTo("abc");
 assertThat(new HashMap<String, Integer>()).isEqualTo(new HashMap<String, Integer>());

 // assertions fail
 assertThat("abc").isEqualTo("123");
 assertThat(new ArrayList<String>()).isEqualTo(1);
      Specified by:
      isEqualTo in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isEqualTo in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expected - the given value to compare the actual value to.
      Returns:
      this assertion object.

    • isExactlyInstanceOf

      public SELF isExactlyInstanceOf(Class<?> type)
      Description copied from class: AbstractAssert
      Verifies that the actual value is exactly an instance of the given type.

      Example: 

       // assertions succeed
 assertThat("abc").isExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isExactlyInstanceOf(ArrayList.class);
 assertThat(new HashMap<String, Integer>()).isExactlyInstanceOf(HashMap.class);

 // assertions fail
 assertThat(1).isExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isExactlyInstanceOf(List.class);
 assertThat(new HashMap<String, Integer>()).isExactlyInstanceOf(Map.class);
      Specified by:
      isExactlyInstanceOf in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isExactlyInstanceOf in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      type - the type to check the actual value against.
      Returns:
      this assertion object.

    • isIn

      public SELF isIn(Iterable<?> values)
      Description copied from class: AbstractAssert
      Verifies that the actual value is present in the given iterable.

      This assertion always fails if the given iterable is empty.

      Example: 

       Iterable<Ring> elvesRings = list(vilya, nenya, narya);

 // assertion succeeds
 assertThat(nenya).isIn(elvesRings);

 // assertions fail:
 assertThat(oneRing).isIn(elvesRings);
 assertThat(oneRing).isIn(emptyList());
      Specified by:
      isIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given iterable to search the actual value in.
      Returns:
      this assertion object.

    • isIn

      public SELF isIn(Object... values)
      Description copied from class: AbstractAssert
      Verifies that the actual value is present in the given array of values.

      This assertion always fails if the given array of values is empty.

      Example: 

       Ring[] elvesRings = new Ring[] { vilya, nenya, narya };

 // assertion succeeds
 assertThat(nenya).isIn(elvesRings);

 // assertions fail
 assertThat(oneRing).isIn(elvesRings);
 assertThat(oneRing).isIn(new Ring[0]);
      Specified by:
      isIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given array to search the actual value in.
      Returns:
      this assertion object.

    • isInstanceOf

      public SELF isInstanceOf(Class<?> type)
      Description copied from class: AbstractAssert
      Verifies that the actual value is an instance of the given type.

      Example: 

       // assertions succeed
 assertThat("abc").isInstanceOf(String.class);
 assertThat(new HashMap<String, Integer>()).isInstanceOf(HashMap.class);
 assertThat(new HashMap<String, Integer>()).isInstanceOf(Map.class);

 // assertions fail
 assertThat(1).isInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isInstanceOf(LinkedList.class);
      Specified by:
      isInstanceOf in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isInstanceOf in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      type - the type to check the actual value against.
      Returns:
      this assertion object.

    • isInstanceOfAny

      public SELF isInstanceOfAny(Class<?>... types)
      Description copied from class: AbstractAssert
      Verifies that the actual value is an instance of any of the given types.

      Example: 

       // assertions succeed
 assertThat("abc").isInstanceOfAny(String.class, Integer.class);
 assertThat(new ArrayList<String>()).isInstanceOfAny(LinkedList.class, ArrayList.class);
 assertThat(new HashMap<String, Integer>()).isInstanceOfAny(TreeMap.class, Map.class);

 // assertions fail
 assertThat(1).isInstanceOfAny(Double.class, Float.class);
 assertThat(new ArrayList<String>()).isInstanceOfAny(LinkedList.class, Vector.class);
      Specified by:
      isInstanceOfAny in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isInstanceOfAny in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the types to check the actual value against.
      Returns:
      this assertion object.

    • isNot

      public SELF isNot(Condition<? super ACTUAL> condition)
      Description copied from class: AbstractAssert
      Verifies that the actual value does not satisfy the given condition. This method is an alias for ExtensionPoints.doesNotHave(Condition).
      Specified by:
      isNot in interface ExtensionPoints<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNot in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      condition - the given condition.
      Returns:
      this ExtensionPoints object.
      See Also:

    • isNotEqualTo

      public SELF isNotEqualTo(Object other)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not equal to the given one.

      Example: 

       // assertions succeed
 assertThat("abc").isNotEqualTo("123");
 assertThat(new ArrayList<String>()).isNotEqualTo(1);

 // assertions fail
 assertThat("abc").isNotEqualTo("abc");
 assertThat(new HashMap<String, Integer>()).isNotEqualTo(new HashMap<String, Integer>());
      Specified by:
      isNotEqualTo in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotEqualTo in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the given value to compare the actual value to.
      Returns:
      this assertion object.

    • isNotExactlyInstanceOf

      public SELF isNotExactlyInstanceOf(Class<?> type)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not exactly an instance of given type.

      Example: 

       // assertions succeed
 assertThat(1).isNotExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isNotExactlyInstanceOf(List.class);
 assertThat(new HashMap<String, Integer>()).isNotExactlyInstanceOf(Map.class);

 // assertions fail
 assertThat("abc").isNotExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isNotExactlyInstanceOf(ArrayList.class);
 assertThat(new HashMap<String, Integer>()).isNotExactlyInstanceOf(HashMap.class);
      Specified by:
      isNotExactlyInstanceOf in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotExactlyInstanceOf in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      type - the type to check the actual value against.
      Returns:
      this assertion object.

    • isNotIn

      public SELF isNotIn(Iterable<?> values)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not present in the given iterable.

      This assertion always succeeds if the given iterable is empty.

      Example: 

       Iterable<Ring> elvesRings = list(vilya, nenya, narya);

 // assertions succeed:
 assertThat(oneRing).isNotIn(elvesRings);
 assertThat(oneRing).isNotIn(emptyList());

 // assertions fails:
 assertThat(nenya).isNotIn(elvesRings);
      Specified by:
      isNotIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given iterable to search the actual value in.
      Returns:
      this assertion object.

    • isNotIn

      public SELF isNotIn(Object... values)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not present in the given array of values.

      This assertion always succeeds if the given array of values is empty.

      Example: 

       Ring[] elvesRings = new Ring[] { vilya, nenya, narya };

 // assertions succeed
 assertThat(oneRing).isNotIn(elvesRings);
 assertThat(oneRing).isNotIn(new Ring[0]);

 // assertions fails:
 assertThat(nenya).isNotIn(elvesRings);
      Specified by:
      isNotIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      values - the given array to search the actual value in.
      Returns:
      this assertion object.

    • isNotInstanceOf

      public SELF isNotInstanceOf(Class<?> type)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not an instance of the given type.

      Example: 

       // assertions succeed
 assertThat(1).isNotInstanceOf(Double.class);
 assertThat(new ArrayList<String>()).isNotInstanceOf(LinkedList.class);

 // assertions fail
 assertThat("abc").isNotInstanceOf(String.class);
 assertThat(new HashMap<String, Integer>()).isNotInstanceOf(HashMap.class);
 assertThat(new HashMap<String, Integer>()).isNotInstanceOf(Map.class);
      Specified by:
      isNotInstanceOf in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotInstanceOf in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      type - the type to check the actual value against.
      Returns:
      this assertion object.

    • isNotInstanceOfAny

      public SELF isNotInstanceOfAny(Class<?>... types)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not an instance of any of the given types.

      Example: 

       // assertions succeed
 assertThat(1).isNotInstanceOfAny(Double.class, Float.class);
 assertThat(new ArrayList<String>()).isNotInstanceOfAny(LinkedList.class, Vector.class);

 // assertions fail
 assertThat(1).isNotInstanceOfAny(Double.class, Integer.class);
 assertThat(new ArrayList<String>()).isNotInstanceOfAny(LinkedList.class, ArrayList.class);
 assertThat(new HashMap<String, Integer>()).isNotInstanceOfAny(TreeMap.class, Map.class);
      Specified by:
      isNotInstanceOfAny in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotInstanceOfAny in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the types to check the actual value against.
      Returns:
      this assertion object.

    • isNotOfAnyClassIn

      public SELF isNotOfAnyClassIn(Class<?>... types)
      Description copied from class: AbstractAssert
      Verifies that the actual value type is not in given types.

      Example: 

       // assertions succeed
 assertThat(new HashMap<String, Integer>()).isNotOfAnyClassIn(Map.class, TreeMap.class);
 assertThat(new ArrayList<String>()).isNotOfAnyClassIn(LinkedList.class, List.class);

 // assertions fail
 assertThat(new HashMap<String, Integer>()).isNotOfAnyClassIn(HashMap.class, TreeMap.class);
 assertThat(new ArrayList<String>()).isNotOfAnyClassIn(ArrayList.class, LinkedList.class);
      Specified by:
      isNotOfAnyClassIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotOfAnyClassIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the types to check the actual value against.
      Returns:
      this assertion object.

    • isNotNull

      public SELF isNotNull()
      Description copied from class: AbstractAssert
      Verifies that the actual value is not null.

      Example: 

       // assertions succeed
 assertThat("abc").isNotNull();
 assertThat(new HashMap<String, Integer>()).isNotNull();

 // assertions fails
 String value = null;
 assertThat(value).isNotNull();
      Specified by:
      isNotNull in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotNull in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • isNotSameAs

      public SELF isNotSameAs(Object other)
      Description copied from class: AbstractAssert
      Verifies that the actual value is not the same as the given one, ie using == comparison.

      Example: 

       // Name is a class with first and last fields, two Names are equals if both first and last are equals.
 Name tyrion = new Name("Tyrion", "Lannister");
 Name alias  = tyrion;
 Name clone  = new Name("Tyrion", "Lannister");

 // assertions succeed:
 assertThat(clone).isNotSameAs(tyrion)
                  .isEqualTo(tyrion);

 // assertion fails:
 assertThat(alias).isNotSameAs(tyrion);
      Specified by:
      isNotSameAs in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isNotSameAs in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      other - the given value to compare the actual value to.
      Returns:
      this assertion object.

    • isOfAnyClassIn

      public SELF isOfAnyClassIn(Class<?>... types)
      Description copied from class: AbstractAssert
      Verifies that the actual value type is in given types.

      Example: 

       // assertions succeed
 assertThat(new HashMap<String, Integer>()).isOfAnyClassIn(HashMap.class, TreeMap.class);
 assertThat(new ArrayList<String>()).isOfAnyClassIn(ArrayList.class, LinkedList.class);

 // assertions fail
 assertThat(new HashMap<String, Integer>()).isOfAnyClassIn(TreeMap.class, Map.class);
 assertThat(new ArrayList<String>()).isOfAnyClassIn(LinkedList.class, List.class);
      Specified by:
      isOfAnyClassIn in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isOfAnyClassIn in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      types - the types to check the actual value against.
      Returns:
      this assertion object.

    • isSameAs

      public SELF isSameAs(Object expected)
      Description copied from class: AbstractAssert
      Verifies that the actual value is the same as the given one, ie using == comparison.

      Example: 

       // Name is a class with first and last fields, two Names are equals if both first and last are equals.
 Name tyrion = new Name("Tyrion", "Lannister");
 Name alias  = tyrion;
 Name clone  = new Name("Tyrion", "Lannister");

 // assertions succeed:
 assertThat(tyrion).isSameAs(alias)
                   .isEqualTo(clone);

 // assertion fails:
 assertThat(tyrion).isSameAs(clone);
      Specified by:
      isSameAs in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      isSameAs in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      expected - the given value to compare the actual value to.
      Returns:
      this assertion object.

    • noneMatch

      public SELF noneMatch(Predicate<? super ELEMENT> predicate)
      Description copied from interface: ObjectEnumerableAssert
      Verifies that no elements match the given Predicate.

      Example : 

       Iterable<String> abcc = newArrayList("a", "b", "cc");

 // assertion will pass
 assertThat(abcc).noneMatch(s -> s.isEmpty());

 // assertion will fail
 assertThat(abcc).noneMatch(s -> s.length() == 2);
      Note that you can achieve the same result with areNot(Condition) or doNotHave(Condition).
      Specified by:
      noneMatch in interface ObjectEnumerableAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      predicate - the given Predicate.
      Returns:
      this object.

    • overridingErrorMessage

      public SELF overridingErrorMessage(String newErrorMessage, Object... args)
      Description copied from class: AbstractAssert
      Overrides AssertJ default error message by the given one.

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      The new error message is built using String.format(String, Object...) if you provide args parameter (if you don't, the error message is taken as it is).

      Example : 

      assertThat(player.isRookie()).overridingErrorMessage("Expecting Player <%s> to be a rookie but was not.", player)
                              .isTrue();
      Overrides:
      overridingErrorMessage in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      newErrorMessage - the error message that will replace the default one provided by Assertj.
      args - the args used to fill error message as in String.format(String, Object...).
      Returns:
      this assertion object.

    • usingDefaultComparator

      public SELF usingDefaultComparator()
      Description copied from class: AbstractAssert
      Revert to standard comparison for the incoming assertion checks.

      This method should be used to disable a custom comparison strategy set by calling usingComparator.

      Specified by:
      usingDefaultComparator in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      usingDefaultComparator in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • usingComparator

      public SELF usingComparator(Comparator<? super ACTUAL> customComparator)
      Description copied from class: AbstractAssert
      Use the given custom comparator instead of relying on actual type A equals method for incoming assertion checks.

      The custom comparator is bound to assertion instance, meaning that if a new assertion instance is created, the default comparison strategy will be used.

      Examples : 

       // frodo and sam are instances of Character with Hobbit race (obviously :).
 // raceComparator implements Comparator<Character>
 assertThat(frodo).usingComparator(raceComparator).isEqualTo(sam);
      Specified by:
      usingComparator in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      usingComparator in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      customComparator - the comparator to use for the incoming assertion checks.
      Returns:
      this assertion object.

    • usingComparator

      public SELF usingComparator(Comparator<? super ACTUAL> customComparator, String customComparatorDescription)
      Description copied from class: AbstractAssert
      Use the given custom comparator instead of relying on actual type A equals method for incoming assertion checks.

      The custom comparator is bound to assertion instance, meaning that if a new assertion instance is created, the default comparison strategy will be used.

      Examples : 

       // frodo and sam are instances of Character with Hobbit race (obviously :).
 // raceComparator implements Comparator<Character>
 assertThat(frodo).usingComparator(raceComparator, "Hobbit Race Comparator").isEqualTo(sam);
      Specified by:
      usingComparator in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      usingComparator in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      customComparator - the comparator to use for the incoming assertion checks.
      customComparatorDescription - comparator description to be used in assertion error messages
      Returns:
      this assertion object.

    • withFailMessage

      public SELF withFailMessage(String newErrorMessage, Object... args)
      Description copied from class: AbstractAssert
      Alternative method for AbstractAssert.overridingErrorMessage(java.lang.String, java.lang.Object...)

      You must set it before calling the assertion otherwise it is ignored as the failing assertion breaks the chained call by throwing an AssertionError.

      Example: 

      assertThat(player.isRookie()).withFailMessage("Expecting Player <%s> to be a rookie but was not.", player)
                              .isTrue();
      Overrides:
      withFailMessage in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Parameters:
      newErrorMessage - the error message that will replace the default one provided by Assertj.
      args - the args used to fill error message as in String.format(String, Object...).
      Returns:
      this assertion object.

    • withThreadDumpOnError

      public SELF withThreadDumpOnError()
      Description copied from class: AbstractAssert
      In case of an assertion error, a thread dump will be printed to System.err.

      Example : 

       assertThat("Messi").withThreadDumpOnError().isEqualTo("Ronaldo");
      will print a thread dump, something similar to this: 
      "JDWP Command Reader"
 	java.lang.Thread.State: RUNNABLE

 "JDWP Event Helper Thread"
 	java.lang.Thread.State: RUNNABLE

 "JDWP Transport Listener: dt_socket"
 	java.lang.Thread.State: RUNNABLE

 "Signal Dispatcher"
 	java.lang.Thread.State: RUNNABLE

 "Finalizer"
 	java.lang.Thread.State: WAITING
 		at java.lang.Object.wait(Native Method)
 		at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135)
 		at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151)
 		at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)

 "Reference Handler"
 	java.lang.Thread.State: WAITING
 		at java.lang.Object.wait(Native Method)
 		at java.lang.Object.wait(Object.java:503)
 		at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)

 "main"
 	java.lang.Thread.State: RUNNABLE
 		at sun.management.ThreadImpl.dumpThreads0(Native Method)
 		at sun.management.ThreadImpl.dumpAllThreads(ThreadImpl.java:446)
 		at org.assertj.core.internal.Failures.threadDumpDescription(Failures.java:193)
 		at org.assertj.core.internal.Failures.printThreadDumpIfNeeded(Failures.java:141)
 		at org.assertj.core.internal.Failures.failure(Failures.java:91)
 		at org.assertj.core.internal.Objects.assertEqual(Objects.java:314)
 		at org.assertj.core.api.AbstractAssert.isEqualTo(AbstractAssert.java:198)
 		at org.assertj.examples.ThreadDumpOnErrorExample.main(ThreadDumpOnErrorExample.java:28)
      Specified by:
      withThreadDumpOnError in interface Assert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Overrides:
      withThreadDumpOnError in class AbstractAssert<SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT>,ACTUAL extends Iterable<? extends ELEMENT>>
      Returns:
      this assertion object.

    • size

      public AbstractIterableSizeAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT> size()
      Returns an Assert object that allows performing assertions on the size of the Iterable under test.

      Once this method is called, the object under test is no longer the Iterable but its size, to perform assertions on the Iterable, call AbstractIterableSizeAssert.returnToIterable().

      Example: 

       Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);

 // assertion will pass:
 assertThat(elvesRings).size().isGreaterThan(1)
                              .isLessThanOrEqualTo(3)
                       .returnToIterable().contains(narya)
                                          .doesNotContain(oneRing);

 // assertion will fail:
 assertThat(elvesRings).size().isGreaterThan(3);
      Returns:
      AbstractIterableSizeAssert built with the Iterable's size.
      Throws:
      NullPointerException - if the given Iterable is null.

    • getComparatorsByType

      protected org.assertj.core.internal.TypeComparators getComparatorsByType()

    • getComparatorsForElementPropertyOrFieldTypes

      protected org.assertj.core.internal.TypeComparators getComparatorsForElementPropertyOrFieldTypes()

    • newAbstractIterableAssert

      protected abstract SELF newAbstractIterableAssert(Iterable<? extends ELEMENT> iterable)
      This methods is needed to build a new concrete instance of AbstractIterableAssert after a filtering operation is executed.

      If you create your own subclass of AbstractIterableAssert, simply returns an instance of it in this method.

      Parameters:
      iterable - the iterable used to build the concrete instance of AbstractIterableAssert
      Returns:
      concrete instance of AbstractIterableAssert