Package org.assertj.core.api

Class AbstractOptionalAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,VALUE>

java.lang.Object
org.assertj.core.api.AbstractAssert<SELF,Optional<VALUE>>
org.assertj.core.api.AbstractOptionalAssert<SELF,VALUE>
Type Parameters:
SELF - the "self" type of this assertion class.
VALUE - type of the value contained in the Optional.
All Implemented Interfaces:
Assert<SELF,Optional<VALUE>>, Descriptable<SELF>, ExtensionPoints<SELF,Optional<VALUE>>
Direct Known Subclasses:
OptionalAssert
public abstract class AbstractOptionalAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,VALUE> extends AbstractAssert<SELF,Optional<VALUE>>
Assertions for Optional.
Author:
Jean-Christophe Gay, Nicolai Parlog, Grzegorz Piwowarek

  • Constructor Details

    • AbstractOptionalAssert

      protected AbstractOptionalAssert(Optional<VALUE> actual, Class<?> selfType)

  • Method Details

    • isPresent

      public SELF isPresent()
      Verifies that there is a value present in the actual Optional.

      Assertion will pass : 

       assertThat(Optional.of("something")).isPresent();
      Assertion will fail : 
       assertThat(Optional.empty()).isPresent();
      Returns:
      this assertion object.

    • isNotEmpty

      public SELF isNotEmpty()
      Verifies that there is a value present in the actual Optional, it's an alias of isPresent().

      Assertion will pass : 

       assertThat(Optional.of("something")).isNotEmpty();
      Assertion will fail : 
       assertThat(Optional.empty()).isNotEmpty();
      Returns:
      this assertion object.

    • isEmpty

      public SELF isEmpty()
      Verifies that the actual Optional is empty.

      Assertion will pass : 

       assertThat(Optional.empty()).isEmpty();
      Assertion will fail : 
       assertThat(Optional.of("something")).isEmpty();
      Returns:
      this assertion object.

    • isNotPresent

      public SELF isNotPresent()
      Verifies that the actual Optional is empty (alias of isEmpty()).

      Assertion will pass : 

       assertThat(Optional.empty()).isNotPresent();
      Assertion will fail : 
       assertThat(Optional.of("something")).isNotPresent();
      Returns:
      this assertion object.

    • contains

      public SELF contains(VALUE expectedValue)
      Verifies that the actual Optional contains the given value (alias of hasValue(Object)).

      Assertion will pass : 

       assertThat(Optional.of("something")).contains("something");
 assertThat(Optional.of(10)).contains(10);
      Assertion will fail : 
       assertThat(Optional.of("something")).contains("something else");
 assertThat(Optional.of(20)).contains(10);
      Parameters:
      expectedValue - the expected value inside the Optional.
      Returns:
      this assertion object.

    • hasValueSatisfying

      public SELF hasValueSatisfying(Consumer<VALUE> requirement)
      Verifies that the actual Optional contains a value and gives this value to the given Consumer for further assertions. Should be used as a way of deeper asserting on the containing object, as further requirement(s) for the value.

      Assertions will pass : 

       // one requirement
 assertThat(Optional.of(10)).hasValueSatisfying(i -> { assertThat(i).isGreaterThan(9); });

 // multiple requirements
 assertThat(Optional.of(someString)).hasValueSatisfying(s -> {
   assertThat(s).isEqualTo("something");
   assertThat(s).startsWith("some");
   assertThat(s).endsWith("thing");
 });
      Assertions will fail : 
       assertThat(Optional.of("something")).hasValueSatisfying(s -> {
     assertThat(s).isEqualTo("something else");
   });

 // fail because optional is empty, there is no value to perform assertion on
 assertThat(Optional.empty()).hasValueSatisfying(o -> {});
      Parameters:
      requirement - to further assert on the object contained inside the Optional.
      Returns:
      this assertion object.

    • hasValueSatisfying

      public SELF hasValueSatisfying(Condition<? super VALUE> condition)
      Verifies that the actual Optional contains a value which satisfies the given Condition.

      Examples: 

       Condition<TolkienCharacter> isAnElf = new Condition<>(character -> character.getRace() == ELF, "an elf");

 TolkienCharacter legolas = new TolkienCharacter("Legolas", 1000, ELF);
 TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);

 // assertion succeeds
 assertThat(Optional.of(legolas)).hasValueSatisfying(isAnElf);

 // assertion fails
 assertThat(Optional.of(frodo)).hasValueSatisfying(isAnElf);
      Parameters:
      condition - the given condition.
      Returns:
      this assertion object.
      Throws:
      AssertionError - if the actual Optional is null or empty.
      NullPointerException - if the given condition is null.
      AssertionError - if the actual value does not satisfy the given condition.
      Since:
      3.6.0

    • hasValue

      public SELF hasValue(VALUE expectedValue)
      Verifies that the actual Optional contains the given value (alias of contains(Object)).

      Assertion will pass : 

       assertThat(Optional.of("something")).hasValue("something");
 assertThat(Optional.of(10)).contains(10);
      Assertion will fail : 
       assertThat(Optional.of("something")).hasValue("something else");
 assertThat(Optional.of(20)).contains(10);
      Parameters:
      expectedValue - the expected value inside the Optional.
      Returns:
      this assertion object.

    • containsInstanceOf

      public SELF containsInstanceOf(Class<?> clazz)
      Verifies that the actual Optional contains a value that is an instance of the argument.

      Assertions will pass: 

       assertThat(Optional.of("something")).containsInstanceOf(String.class)
                                     .containsInstanceOf(Object.class);

 assertThat(Optional.of(10)).containsInstanceOf(Integer.class);
      Assertion will fail: 
       assertThat(Optional.of("something")).containsInstanceOf(Integer.class);
      Parameters:
      clazz - the expected class of the value inside the Optional.
      Returns:
      this assertion object.

    • usingFieldByFieldValueComparator

      @Deprecated public SELF usingFieldByFieldValueComparator()
      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 get() chained with AbstractObjectAssert.usingRecursiveComparison() instead. 
       TolkienCharacter frodo = new TolkienCharacter("Frodo", 33, HOBBIT);
 TolkienCharacter frodoClone = new TolkienCharacter("Frodo", 33, HOBBIT);

 // frodo and frodoClone are equals when doing a field by field comparison.
 assertThat(Optional.of(frodo)).get().usingRecursiveComparison()
                               .isEqualTo(frodoClone);

      See https://assertj.github.io/doc/#assertj-core-recursive-comparison
      Use field/property by field/property comparison (including inherited fields/properties) instead of relying on actual type A equals method to compare the Optional value's object 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 Optional value's object 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.

      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(Optional.of(frodo)).contains(frodoClone);

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

    • usingValueComparator

      public SELF usingValueComparator(Comparator<? super VALUE> customComparator)
      Use given custom comparator instead of relying on actual type A equals method to compare the Optional value's object 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 : 

       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(Optional.of(frodo)).contains(frodoClone);

 // frodo and frodoClone are equals when doing a field by field comparison.
 assertThat(Optional.of(frodo)).usingValueComparator(new FieldByFieldComparator()).contains(frodoClone);
      Parameters:
      customComparator - the comparator to use for incoming assertion checks.
      Returns:
      this assertion object.
      Throws:
      NullPointerException - if the given comparator is null.

    • usingDefaultValueComparator

      public SELF usingDefaultValueComparator()
      Revert to standard comparison for incoming assertion Optional value checks.

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

      Returns:
      this assertion object.

    • containsSame

      public SELF containsSame(VALUE expectedValue)
      Verifies that the actual Optional contains the instance given as an argument (i.e. it must be the same instance).

      Assertion will pass : 

       String someString = "something";
 assertThat(Optional.of(someString)).containsSame(someString);

 // Java will create the same 'Integer' instance when boxing small ints
 assertThat(Optional.of(10)).containsSame(10);
      Assertion will fail : 
       // not even equal:
 assertThat(Optional.of("something")).containsSame("something else");
 assertThat(Optional.of(20)).containsSame(10);

 // equal but not the same:
 assertThat(Optional.of(new String("something"))).containsSame(new String("something"));
 assertThat(Optional.of(new Integer(10))).containsSame(new Integer(10));
      Parameters:
      expectedValue - the expected value inside the Optional.
      Returns:
      this assertion object.

    • flatMap

      public <U> AbstractOptionalAssert<?,U> flatMap(Function<? super VALUE,Optional<U>> mapper)
      Call flatMap on the Optional under test, assertions chained afterwards are performed on the Optional resulting from the flatMap call.

      Examples: 

       Function<String, Optional<String>> UPPER_CASE_OPTIONAL_STRING =
       s -> s == null ? Optional.empty() : Optional.of(s.toUpperCase());

 // assertions succeed
 assertThat(Optional.of("something")).contains("something")
                                     .flatMap(UPPER_CASE_OPTIONAL_STRING)
                                     .contains("SOMETHING");

 assertThat(Optional.<String>empty()).flatMap(UPPER_CASE_OPTIONAL_STRING)
                                     .isEmpty();

 assertThat(Optional.<String>ofNullable(null)).flatMap(UPPER_CASE_OPTIONAL_STRING)
                                              .isEmpty();

 // assertion fails
 assertThat(Optional.of("something")).flatMap(UPPER_CASE_OPTIONAL_STRING)
                                     .contains("something");
      Type Parameters:
      U - the type wrapped in the Optional after the flatMap operation.
      Parameters:
      mapper - the Function to use in the flatMap operation.
      Returns:
      a new AbstractOptionalAssert for assertions chaining on the flatMap of the Optional.
      Throws:
      AssertionError - if the actual Optional is null.
      Since:
      3.6.0

    • map

      public <U> AbstractOptionalAssert<?,U> map(Function<? super VALUE,? extends U> mapper)
      Call map on the Optional under test, assertions chained afterwards are performed on the Optional resulting from the map call.

      Examples: 

       // assertions succeed
 assertThat(Optional.<String>empty()).map(String::length)
                                     .isEmpty();

 assertThat(Optional.of("42")).contains("42")
                              .map(String::length)
                              .contains(2);

 // assertion fails
 assertThat(Optional.of("42")).map(String::length)
                              .contains(3);
      Type Parameters:
      U - the type wrapped in the Optional after the map operation.
      Parameters:
      mapper - the Function to use in the map operation.
      Returns:
      a new AbstractOptionalAssert for assertions chaining on the map of the Optional.
      Throws:
      AssertionError - if the actual Optional is null.
      Since:
      3.6.0

    • get

      public AbstractObjectAssert<?,VALUE> get()
      Verifies that the actual Optional is not null and not empty and returns an Object assertion that allows chaining (object) assertions on the optional value.

      Note that it is only possible to return Object assertions after calling this method due to java generics limitations.

      Example: 

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

 // assertion succeeds since all frodo's fields are set
 assertThat(Optional.of(frodo)).get().hasNoNullFieldsOrProperties();

 // assertion does not succeed because sam does not have its race set
 assertThat(Optional.of(sam)).get().hasNoNullFieldsOrProperties();
      Returns:
      a new AbstractObjectAssert for assertions chaining on the value of the Optional.
      Throws:
      AssertionError - if the actual Optional is null.
      AssertionError - if the actual Optional is empty.
      Since:
      3.9.0
      See Also:

    • get

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT get(InstanceOfAssertFactory<?,ASSERT> assertFactory)
      Verifies that the actual Optional is not null and not empty and returns an new assertion instance to chain assertions on the optional value.

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

      Wrapping the given InstanceOfAssertFactory with Assertions.as(InstanceOfAssertFactory) makes the assertion more readable.

      Example: 

       // assertion succeeds
 assertThat(Optional.of("frodo")).get(as(InstanceOfAssertFactories.STRING)).startsWith("fro");

 // assertion does not succeed because frodo is not an Integer
 assertThat(Optional.of("frodo")).get(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 value of the Optional
      Throws:
      NullPointerException - if the given factory is null
      AssertionError - if the actual Optional is null
      AssertionError - if the actual Optional is empty
      Since:
      3.14.0

    • usingRecursiveComparison

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

      Example: 

       public class Person {
   String name;
   boolean hasPhd;
 }

 public class Doctor {
  String name;
  boolean hasPhd;
 }

 Doctor drSheldon = new Doctor("Sheldon Cooper", true);
 Person sheldon = new Person("Sheldon Cooper", true);

 Optional<Doctor> doctor = Optional.of(drSheldon);
 Optional<Person> person = Optional.of(sheldon);

 // assertion succeeds as both maps contains equivalent items.
 assertThat(doctor).usingRecursiveComparison()
                   .isEqualTo(person);

 // assertion fails because leonard names are different.
 drSheldon.setName("Sheldon Kooper");
 assertThat(doctor).usingRecursiveComparison()
                   .isEqualTo(person);
      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:

      Overrides:
      usingRecursiveComparison in class AbstractAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,Optional<VALUE>>
      Returns:
      a new RecursiveComparisonAssert instance
      See Also:

    • usingRecursiveComparison

      public RecursiveComparisonAssert<?> usingRecursiveComparison(RecursiveComparisonConfiguration recursiveComparisonConfiguration)
      Same as usingRecursiveComparison() but allows to specify your own RecursiveComparisonConfiguration.
      Overrides:
      usingRecursiveComparison in class AbstractAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,Optional<VALUE>>
      Parameters:
      recursiveComparisonConfiguration - the RecursiveComparisonConfiguration used in the chained isEqualTo assertion.
      Returns:
      a new RecursiveComparisonAssert instance built with the given RecursiveComparisonConfiguration.

    • usingRecursiveAssertion

      public RecursiveAssertionAssert usingRecursiveAssertion()

      Asserts that the given predicate is met for all fields of the object under test recursively (but not the object itself).

      For example if the object under test is an instance of class A, A has a B field and B a C field then the assertion checks A's B field and B's C field and all C's fields.

      The recursive algorithm employs cycle detection, so object graphs with cyclic references can safely be asserted over without causing looping.

      This method enables recursive asserting using default configuration, which means all fields of all objects have the Predicate applied to them (including primitive fields), no fields are excluded, but:

      • The recursion does not enter into Java Class Library types (java.*, javax.*)
      • The Predicate is applied to Collection and array elements (but the collection/array itself)
      • The Predicate is applied to Map values but not the map itself or its keys
      • The Predicate is applied to Optional and primitive optional values

      It is possible to assert several predicates over the object graph in a row.

      The classes used in recursive asserting are not thread safe. Care must be taken when running tests in parallel not to run assertions over object graphs that are being shared between tests.

      Example

       class Author {
   String name;
   String email;
   List<Book> books = new ArrayList<>();

   Author(String name, String email) {
     this.name = name;
     this.email = email;
   }
 }

 class Book {
   String title;
   Author[] authors;

   Book(String title, Author[] authors) {
     this.title = title;
     this.authors = authors;
   }
 }

 Author pramodSadalage = new Author("Pramod Sadalage", "[email protected]");
 Author martinFowler = new Author("Martin Fowler", "[email protected]");
 Author kentBeck = new Author("Kent Beck", "[email protected]");

 Book noSqlDistilled = new Book("NoSql Distilled", new Author[] {pramodSadalage, martinFowler});
 pramodSadalage.books.add(noSqlDistilled);
 martinFowler.books.add(noSqlDistilled);

 Book refactoring = new Book("Refactoring", new Author[] {martinFowler, kentBeck});
 martinFowler.books.add(refactoring);
 kentBeck.books.add(refactoring);

 // assertion succeeds
 assertThat(Optional.of(pramodSadalage)).usingRecursiveAssertion()
                                        .allFieldsSatisfy(field -> field != null);

      In case one or more fields in the object graph fails the predicate test, the entire assertion will fail. Failing fields will be listed in the failure report using a JSON path-ish notation.

      Overrides:
      usingRecursiveAssertion in class AbstractAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,Optional<VALUE>>
      Returns:
      A new instance of RecursiveAssertionAssert built with a default RecursiveAssertionConfiguration.

    • usingRecursiveAssertion

      public RecursiveAssertionAssert usingRecursiveAssertion(org.assertj.core.api.recursive.assertion.RecursiveAssertionConfiguration recursiveAssertionConfiguration)

      The same as usingRecursiveAssertion(), but this method allows the developer to pass in an explicit recursion configuration. This configuration gives fine-grained control over what to include in the recursion, such as:

      • Exclusion of fields that are null
      • Exclusion of fields by path
      • Exclusion of fields by type
      • Exclusion of primitive fields
      • Inclusion of Java Class Library types in the recursive execution
      • Treatment of Collection and array objects
      • Treatment of Map objects
      • Treatment of Optional and primitive Optional objects

      Please refer to the documentation of RecursiveAssertionConfiguration.Builder for more details.

      Overrides:
      usingRecursiveAssertion in class AbstractAssert<SELF extends AbstractOptionalAssert<SELF,VALUE>,Optional<VALUE>>
      Parameters:
      recursiveAssertionConfiguration - The recursion configuration described above.
      Returns:
      A new instance of RecursiveAssertionAssert built with a default RecursiveAssertionConfiguration.