Package org.assertj.core.api

Class AbstractAssert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>

    • Field Detail

      • throwUnsupportedExceptionOnEquals

        public static boolean throwUnsupportedExceptionOnEquals

      • objects

        protected org.assertj.core.internal.Objects objects

      • conditions

        org.assertj.core.internal.Conditions conditions

      • actual

        protected final ACTUAL actual

      • printAssertionsDescription

        static boolean printAssertionsDescription

    • Constructor Detail

      • AbstractAssert

        protected AbstractAssert​(ACTUAL actual,
                         Class<?> selfType)

    • Method Detail

      • failWithMessage

        protected void failWithMessage​(String errorMessage,
                               Object... arguments)
        Throw an assertion error based on information in this assertion. Equivalent to: 
        throw failure(errorMessage, arguments);

        This method is a thin wrapper around failure() - see that method for a more detailed description.

        Note that generally speaking, using failure() directly is preferable to using this wrapper method, as the compiler and other code analysis tools will be able to tell that the statement will never return normally and respond appropriately.

        Parameters:
        errorMessage - the error message to format
        arguments - the arguments referenced by the format specifiers in the errorMessage string.
        See Also:
        failWithActualExpectedAndMessage(Object, Object, String, Object...), failure(String, Object...)

      • failure

        protected AssertionError failure​(String errorMessage,
                                 Object... arguments)
        Generate a custom assertion error using the information in this assertion.

        This is a utility method to ease writing custom assertions classes using String.format(String, Object...) specifiers in error message.

        Moreover, this method honors any description set with Descriptable.as(String, Object...) or overridden error message defined by the user with overridingErrorMessage(String, Object...).

        Example: 

         public TolkienCharacterAssert hasName(String name) {
   // check that actual TolkienCharacter we want to make assertions on is not null.
   isNotNull();

   // check condition
   if (!actual.getName().equals(name)) {
     failWithMessage("Expected character's name to be <%s> but was <%s>", name, actual.getName());
   }

   // return the current assertion for method chaining
   return this;
 }
        Parameters:
        errorMessage - the error message to format
        arguments - the arguments referenced by the format specifiers in the errorMessage string.
        Returns:
        The generated assertion error.
        See Also:
        failureWithActualExpected(Object, Object, String, Object...), failWithMessage(String, Object...)

      • failWithActualExpectedAndMessage

        protected void failWithActualExpectedAndMessage​(Object actual,
                                                Object expected,
                                                String errorMessageFormat,
                                                Object... arguments)
        Throw an assertion error based on information in this assertion. Equivalent to: 
        throw failureWithActualExpected(actual, expected, errorMessageFormat, arguments);

        This method is a thin wrapper around failureWithActualExpected() - see that method for a more detailed description. Note that generally speaking, using failureWithActualExpected() directly is preferable to using this wrapper method, as the compiler and other code analysis tools will be able to tell that the statement will never return normally and respond appropriately.

        Parameters:
        actual - the actual object that was found during the test
        expected - the object that was expected
        errorMessageFormat - the error message to format
        arguments - the arguments referenced by the format specifiers in the errorMessage string.
        See Also:
        failWithMessage(String, Object...), failureWithActualExpected(Object, Object, String, Object...)

      • failureWithActualExpected

        protected AssertionError failureWithActualExpected​(Object actual,
                                                   Object expected,
                                                   String errorMessageFormat,
                                                   Object... arguments)
        Generate a custom assertion error using the information in this assertion, using the given actual and expected values.

        This is a utility method to ease writing custom assertions classes using String.format(String, Object...) specifiers in error message with actual and expected values.

        Moreover, this method honors any description set with Descriptable.as(String, Object...) or overridden error message defined by the user with overridingErrorMessage(String, Object...).

        This method also sets the "actual" and "expected" fields of the assertion if available (eg, if OpenTest4J is on the path). This aids IDEs to produce visual diffs of the resulting values.

        Example : 

         public TolkienCharacterAssert hasName(String name) {
   // check that actual TolkienCharacter we want to make assertions on is not null.
   isNotNull();

   // check condition
   if (!actual.getName().equals(name)) {
     throw failureWithActualExpected(actual.getName(), name, "Expected character's name to be <%s> but was <%s>", name, actual.getName());
   }

   // return the current assertion for method chaining
   return this;
 }
        Parameters:
        actual - the actual object that was found during the test
        expected - the object that was expected
        errorMessageFormat - the error message to format
        arguments - the arguments referenced by the format specifiers in the errorMessage string.
        Returns:
        The generated assertion error.
        See Also:
        failure(String, Object...), failWithActualExpectedAndMessage(Object, Object, String, Object...)

      • throwAssertionError

        protected void throwAssertionError​(ErrorMessageFactory errorMessageFactory)
        Utility method to throw an AssertionError given a BasicErrorMessageFactory.

        Instead of writing ... 

         throw Failures.instance().failure(info, ShouldBePresent.shouldBePresent());
        ... you can simply write : 
         throwAssertionError(info, ShouldBePresent.shouldBePresent());
        Parameters:
        errorMessageFactory - used to define the error message.
        Throws:
        AssertionError - with a message corresponding to the given BasicErrorMessageFactory.

      • removeCustomAssertRelatedElementsFromStackTraceIfNeeded

        private void removeCustomAssertRelatedElementsFromStackTraceIfNeeded​(AssertionError assertionError)

      • isAssertjAssertClass

        private boolean isAssertjAssertClass()

      • isElementOfCustomAssert

        protected boolean isElementOfCustomAssert​(StackTraceElement stackTraceElement)

      • inHexadecimal

        protected SELF inHexadecimal()
        Use hexadecimal object representation instead of standard representation in error messages.

        It can be useful when comparing UNICODE characters - many unicode chars have duplicate characters assigned, it is thus impossible to find differences from the standard error message:

        With standard message: 

         assertThat("µµµ").contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <"µµµ">
 to contain:
   <"μμμ">
        With Hexadecimal message: 
         assertThat("µµµ").inHexadecimal().contains("μμμ");

 java.lang.AssertionError:
 Expecting:
   <"['00B5', '00B5', '00B5']">
 to contain:
   <"['03BC', '03BC', '03BC']">
        Returns:
        this assertion object.

      • inBinary

        protected SELF inBinary()
        Use binary object representation instead of standard representation in error messages.

        Example: 

         assertThat(1).inBinary().isEqualTo(2);

 org.junit.ComparisonFailure:
 Expected :0b00000000_00000000_00000000_00000010
 Actual   :0b00000000_00000000_00000000_00000001
        Returns:
        this assertion object.

      • describedAs

        public SELF describedAs​(Description description)
        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 AbstractAssert<SELF,​ACTUAL>>
        Parameters:
        description - the new description to set.
        Returns:
        this object.

      • printDescriptionText

        private void printDescriptionText()

      • isEqualTo

        public SELF isEqualTo​(Object expected)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        expected - the given value to compare the actual value to.
        Returns:
        this assertion object.

      • isNotEqualTo

        public SELF isNotEqualTo​(Object other)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the given value to compare the actual value to.
        Returns:
        this assertion object.

      • isNull

        public void isNull()
        Verifies that the actual value is null.

        Example: 

         String value = null;
 // assertion succeeds
 assertThat(value).isNull();

 // assertions fail
 assertThat("abc").isNull();
 assertThat(new HashMap<String, Integer>()).isNull();
        Specified by:
        isNull in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>

      • isNotNull

        public SELF isNotNull()
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Returns:
        this assertion object.

      • isSameAs

        public SELF isSameAs​(Object expected)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        expected - the given value to compare the actual value to.
        Returns:
        this assertion object.

      • isNotSameAs

        public SELF isNotSameAs​(Object other)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the given value to compare the actual value to.
        Returns:
        this assertion object.

      • isIn

        public SELF isIn​(Object... values)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        values - the given array to search the actual value in.
        Returns:
        this assertion object.

      • isNotIn

        public SELF isNotIn​(Object... values)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        values - the given array to search the actual value in.
        Returns:
        this assertion object.

      • isIn

        public SELF isIn​(Iterable<?> values)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        values - the given iterable to search the actual value in.
        Returns:
        this assertion object.

      • isNotIn

        public SELF isNotIn​(Iterable<?> values)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        values - the given iterable to search the actual value in.
        Returns:
        this assertion object.

      • satisfies

        public SELF satisfies​(Condition<? super ACTUAL> condition)
        Verifies that the actual value satisfies the given condition. This method is an alias for ExtensionPoints.is(Condition).

        Example: 

         // Given
 Condition<String> fairyTale = new Condition<>(s -> s.startsWith("Once upon a time"), "fairy tale start");
 // When
 String littleRedCap = "Once upon a time there was a dear little girl ...";
 // Then
 assertThat(littleRedCap).satisfies(fairyTale);
        Specified by:
        satisfies in interface ExtensionPoints<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        condition - the given condition.
        Returns:
        this ExtensionPoints object.
        See Also:
        ExtensionPoints.is(Condition)

      • asInstanceOf

        public <ASSERT extends AbstractAssert<?,​?>> ASSERT asInstanceOf​(InstanceOfAssertFactory<?,​ASSERT> instanceOfAssertFactory)
        Uses an InstanceOfAssertFactory to verify that the actual value is an instance of a given type and to produce a new Assert narrowed to that type.

        InstanceOfAssertFactories provides static factories for all the types supported by Assertions#assertThat.

        Additional factories can be created with custom InstanceOfAssertFactory instances.

        Example: 

         // assertions succeeds
 Object string = "abc";
 assertThat(string).asInstanceOf(InstanceOfAssertFactories.STRING).startsWith("ab");

 Object integer = 1;
 assertThat(integer).asInstanceOf(InstanceOfAssertFactories.INTEGER).isNotZero();

 // assertions fails
 assertThat("abc").asInstanceOf(InstanceOfAssertFactories.INTEGER);
        Specified by:
        asInstanceOf in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Type Parameters:
        ASSERT - the type of the resulting Assert.
        Parameters:
        instanceOfAssertFactory - the factory which verifies the type and creates the new Assert.
        Returns:
        the narrowed Assert instance.
        See Also:
        InstanceOfAssertFactory, InstanceOfAssertFactories

      • isInstanceOf

        public SELF isInstanceOf​(Class<?> type)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        type - the type to check the actual value against.
        Returns:
        this assertion object.

      • isInstanceOfSatisfying

        public <T> SELF isInstanceOfSatisfying​(Class<T> type,
                                       Consumer<T> requirements)
        Verifies that the actual value is an instance of the given type satisfying the given requirements expressed as a Consumer.

        This is useful to perform a group of assertions on a single object after checking its runtime type.

        Example: 

         // second constructor parameter is the light saber color
 Object yoda = new Jedi("Yoda", "Green");
 Object luke = new Jedi("Luke Skywalker", "Green");

 Consumer<Jedi> jediRequirements = jedi -> {
   assertThat(jedi.getLightSaberColor()).isEqualTo("Green");
   assertThat(jedi.getName()).doesNotContain("Dark");
 };

 // assertions succeed:
 assertThat(yoda).isInstanceOfSatisfying(Jedi.class, jediRequirements);
 assertThat(luke).isInstanceOfSatisfying(Jedi.class, jediRequirements);

 // assertions fail:
 Jedi vader = new Jedi("Vader", "Red");
 assertThat(vader).isInstanceOfSatisfying(Jedi.class, jediRequirements);
 // not a Jedi !
 assertThat("foo").isInstanceOfSatisfying(Jedi.class, jediRequirements);
        Specified by:
        isInstanceOfSatisfying in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Type Parameters:
        T - the generic type to check the actual value against.
        Parameters:
        type - the type to check the actual value against.
        requirements - the requirements expressed as a Consumer.
        Returns:
        this assertion object.

      • isInstanceOfAny

        public SELF isInstanceOfAny​(Class<?>... types)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        types - the types to check the actual value against.
        Returns:
        this assertion object.

      • isNotInstanceOf

        public SELF isNotInstanceOf​(Class<?> type)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        type - the type to check the actual value against.
        Returns:
        this assertion object.

      • isNotInstanceOfAny

        public SELF isNotInstanceOfAny​(Class<?>... types)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        types - the types to check the actual value against.
        Returns:
        this assertion object.

      • hasSameClassAs

        public SELF hasSameClassAs​(Object other)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the object to check type against.
        Returns:
        this assertion object.

      • hasToString

        public SELF hasToString​(String expectedToString)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        expectedToString - the expected String description of actual.
        Returns:
        this assertion object.

      • doesNotHaveToString

        public SELF doesNotHaveToString​(String otherToString)
        Verifies that actual actual.toString() is not equal to the given String.

        Example : 

         CartoonCharacter homer = new CartoonCharacter("Homer");

 // Instead of writing ...
 assertThat(homer.toString()).isNotEqualTo("Marge");
 // ... you can simply write:
 assertThat(homer).doesNotHaveToString("Marge");
        Specified by:
        doesNotHaveToString in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        otherToString - the String to check against.
        Returns:
        this assertion object.

      • doesNotHaveSameClassAs

        public SELF doesNotHaveSameClassAs​(Object other)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the object to check type against.
        Returns:
        this assertion object.

      • isExactlyInstanceOf

        public SELF isExactlyInstanceOf​(Class<?> type)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        type - the type to check the actual value against.
        Returns:
        this assertion object.

      • isNotExactlyInstanceOf

        public SELF isNotExactlyInstanceOf​(Class<?> type)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        type - the type to check the actual value against.
        Returns:
        this assertion object.

      • isOfAnyClassIn

        public SELF isOfAnyClassIn​(Class<?>... types)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        types - the types to check the actual value against.
        Returns:
        this assertion object.

      • isNotOfAnyClassIn

        public SELF isNotOfAnyClassIn​(Class<?>... types)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        types - the types to check the actual value against.
        Returns:
        this assertion object.

      • asList

        public AbstractListAssert<?,​List<?>,​Object,​ObjectAssert<Object>> asList()
        Verifies that the actual value is an instance of List, and returns a list assertion, to allow chaining of list-specific assertions from this call.

        Example : 

         Object sortedListAsObject = Arrays.asList(1, 2, 3);

 // assertion succeeds
 assertThat(sortedListAsObject).asList().isSorted();

 Object unsortedListAsObject = Arrays.asList(3, 1, 2);

 // assertions fails
 assertThat(unsortedListAsObject).asList().isSorted();
        Specified by:
        asList in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Returns:
        a list assertion object

      • asString

        public AbstractStringAssert<?> asString()
        Returns a String assertion for the toString() of the actual value, to allow chaining of String-specific assertions from this call.

        Example : 

         Object stringAsObject = "hello world";

 // assertion succeeds
 assertThat(stringAsObject).asString().contains("hello");

 // assertions fails
 assertThat(stringAsObject).asString().contains("holla");
        Specified by:
        asString in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Returns:
        a string assertion object

      • overridingErrorMessage

        public SELF overridingErrorMessage​(String newErrorMessage,
                                   Object... args)
        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();
        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.

      • overridingErrorMessage

        public SELF overridingErrorMessage​(Supplier<String> supplier)
        Overrides AssertJ default error message by the given one.

        The new error message is only built if the assertion fails (by consuming the given supplier), this is useful if building messages is expensive.

        You must set the message before calling the assertion otherwise it is ignored as the failing assertion breaks the call chain by throwing an AssertionError.

        Example : 

        assertThat(player.isRookie()).overridingErrorMessage(() -> "Expecting Player to be a rookie but was not.")
                             .isTrue();
        Parameters:
        supplier - the supplier supplies error message that will replace the default one provided by Assertj.
        Returns:
        this assertion object.

      • withFailMessage

        public SELF withFailMessage​(String newErrorMessage,
                            Object... args)
        Alternative method for 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();
        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.

      • withFailMessage

        public SELF withFailMessage​(Supplier<String> supplier)
        Alternative method for overridingErrorMessage(java.lang.String, java.lang.Object...)

        The new error message is only built if the assertion fails (by consuming the given supplier), this is useful if building messages is expensive.

        You must set the message before calling the assertion otherwise it is ignored as the failing assertion breaks the call chain by throwing an AssertionError.

        Example: 

        assertThat(player.isRookie()).withFailMessage(() -> "Expecting Player to be a rookie but was not.")
                              .isTrue();
        Parameters:
        supplier - the supplier supplies error message that will replace the default one provided by Assertj.
        Returns:
        this assertion object.

      • usingComparator

        public SELF usingComparator​(Comparator<? super ACTUAL> customComparator)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        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)
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        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.

      • withThreadDumpOnError

        public SELF withThreadDumpOnError()
        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 AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Returns:
        this assertion object.

      • withRepresentation

        public SELF withRepresentation​(Representation representation)
        Use the given Representation to describe/represent values in AssertJ error messages.

        The usual way to introduce a new Representation is to extend StandardRepresentation and override any existing toStringOf methods that don't suit you. For example you can control Date formatting by overriding StandardRepresentation.toStringOf(Date)).

        You can also control other types format by overriding StandardRepresentation.toStringOf(Object)) calling your formatting method first and then fall back to the default representation by calling super.toStringOf(Object).

        Example : 

         private class Example {}

 private class CustomRepresentation extends StandardRepresentation {

   // override needed to hook specific formatting
   @Override
   public String toStringOf(Object o) {
     if (o instanceof Example) return "Example";
     // fall back to default formatting
     return super.toStringOf(o);
   }

   // change String representation
   @Override
   protected String toStringOf(String s) {
     return "$" + s + "$";
   }
 }

 // next assertion fails with error : "expected:<[null]> but was:<[Example]>"
 Example example = new Example();
 assertThat(example).withRepresentation(new CustomRepresentation())
                    .isNull(); // example is not null !

 // next assertion fails ...
 assertThat("foo").withRepresentation(new CustomRepresentation())
                  .startsWith("bar");
 // ... with error :
 Expecting:
  <$foo$>
 to start with:
  <$bar$>
        Specified by:
        withRepresentation in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        representation - Describe/represent values in AssertJ error messages.
        Returns:
        this assertion object.

      • hashCode

        public int hashCode()
        Always returns 1.
        Overrides:
        hashCode in class Object
        Returns:
        1.

      • matches

        public SELF matches​(Predicate<? super ACTUAL> predicate,
                    String predicateDescription)
        Verifies that the actual object matches the given predicate, the predicate description is used to get an informative error message.

        Example : 

         assertThat(player).matches(p -> p.isRookie(), "is rookie");
        The error message contains the predicate description, if the previous assertion fails, it will be: 
         Expecting:
   <player>
 to match 'is rookie' predicate.
        Parameters:
        predicate - the Predicate to match
        predicateDescription - a description of the Predicate used in the error message
        Returns:
        this assertion object.
        Throws:
        AssertionError - if the actual does not match the given Predicate.
        NullPointerException - if given Predicate is null.
        NullPointerException - if given predicateDescription is null.

      • satisfies

        public SELF satisfies​(Consumer<? super ACTUAL> requirements)
        Verifies that the actual object satisfied the given requirements expressed as a Consumer.

        This is useful to perform a group of assertions on a single object.

        Grouping assertions example : 

         // second constructor parameter is the light saber color
 Jedi yoda = new Jedi("Yoda", "Green");
 Jedi luke = new Jedi("Luke Skywalker", "Green");

 Consumer<Jedi> jediRequirements = jedi -> {
   assertThat(jedi.getLightSaberColor()).isEqualTo("Green");
   assertThat(jedi.getName()).doesNotContain("Dark");
 };

 // assertions succeed:
 assertThat(yoda).satisfies(jediRequirements);
 assertThat(luke).satisfies(jediRequirements);

 // assertions fails:
 Jedi vader = new Jedi("Vader", "Red");
 assertThat(vader).satisfies(jediRequirements);

        In the following example, satisfies prevents the need of define a local variable in order to run multiple assertions: 

         // no need to define team.getPlayers().get(0).getStats() as a local variable
 assertThat(team.getPlayers().get(0).getStats()).satisfies(stats -> {
   assertThat(stats.pointPerGame).isGreaterThan(25.7);
   assertThat(stats.assistsPerGame).isGreaterThan(7.2);
   assertThat(stats.reboundsPerGame).isBetween(9, 12);
 };
        Parameters:
        requirements - to assert on the actual object - must not be null.
        Returns:
        this assertion object.
        Throws:
        NullPointerException - if given Consumer is null

      • internalSatisfies

        private SELF internalSatisfies​(Consumer<? super ACTUAL> requirements)

      • satisfiesAnyOf

        @SafeVarargs
public final SELF satisfiesAnyOf​(Consumer<? super ACTUAL>... assertions)
        Verifies that the actual object under test satisfies at least one of the given assertions group expressed as Consumers.

        This allows users to perform OR like assertions since only one the assertions group has to be met.

        Overriding error message is not supported as it would prevent from getting the error messages of the failing assertions, these are valuable to figure out what went wrong.
        Describing the assertion is supported (for example with Descriptable.as(String, Object...)).

        Example: 

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

 Consumer<TolkienCharacter> isHobbit = tolkienCharacter -> assertThat(tolkienCharacter.getRace()).isEqualTo(HOBBIT);
 Consumer<TolkienCharacter> isElf = tolkienCharacter -> assertThat(tolkienCharacter.getRace()).isEqualTo(ELF);
 Consumer<TolkienCharacter> isDwarf = tolkienCharacter -> assertThat(tolkienCharacter.getRace()).isEqualTo(DWARF);

 // assertion succeeds:
 assertThat(frodo).satisfiesAnyOf(isElf, isHobbit, isDwarf);

 // assertion fails:
 TolkienCharacter boromir = new TolkienCharacter("Boromir", MAN);
 assertThat(boromir).satisfiesAnyOf(isHobbit, isElf, isDwarf);
        Parameters:
        assertions - the group of assertions to run against the object under test - must not be null.
        Returns:
        this assertion object.
        Throws:
        IllegalArgumentException - if any given assertions group is null
        Since:
        3.12.0

      • satisfiesAnyOf

        @SafeVarargs
public final SELF satisfiesAnyOf​(ThrowingConsumer<? super ACTUAL>... assertions)
        Verifies that the actual object under test satisfies at least one of the given assertions group expressed as ThrowingConsumers.

        This allows users to perform OR like assertions since only one the assertions group has to be met.

        This is the same assertion as satisfiesAnyOf(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.

        Overriding error message is not supported as it would prevent from getting the error messages of the failing assertions, these are valuable to figure out what went wrong.
        Describing the assertion is supported (for example with Descriptable.as(String, Object...)).

        Example: 

         // read() throws IOException
 ThrowingConsumer<Reader> hasReachedEOF = reader -> assertThat(reader.read()).isEqualTo(-1);
 ThrowingConsumer<Reader> startsWithZ = reader -> assertThat(reader.read()).isEqualTo('Z');

 // assertion succeeds as the file is empty (note that if hasReachedEOF was declared as a Consumer<Reader> the following line would not compile): 
 assertThat(new FileReader("empty.txt")).satisfiesAnyOf(hasReachedEOF, startsWithZ);

 // alphabet.txt contains: abcdefghijklmnopqrstuvwxyz  
 // assertion fails as alphabet.txt is not empty and starts with 'a':
 assertThat(new FileReader("alphabet.txt")).satisfiesAnyOf(hasReachedEOF, startsWithZ);
        Parameters:
        assertions - the group of assertions to run against the object under test - must not be null.
        Returns:
        this assertion object.
        Throws:
        IllegalArgumentException - if any given assertions group is null
        RuntimeException - rethrown as is by the given ThrowingConsumer or wrapping any Throwable.
        AssertionError - rethrown as is by the given ThrowingConsumer
        Since:
        3.21.0

      • satisfiesAssertions

        private boolean satisfiesAssertions​(Consumer<? super ACTUAL> assertions)

      • setCustomRepresentation

        public static void setCustomRepresentation​(Representation customRepresentation)

      • setPrintAssertionsDescription

        public static void setPrintAssertionsDescription​(boolean printAssertionsDescription)

      • setDescriptionConsumer

        public static void setDescriptionConsumer​(Consumer<Description> descriptionConsumer)

      • hasSameHashCodeAs

        public SELF hasSameHashCodeAs​(Object other)
        Verifies that the actual object has the same hashCode as the given object.

        Example: 

         // assertions succeed
 assertThat(42L).hasSameHashCodeAs(42L);
 assertThat("The Force").hasSameHashCodeAs("The Force");
 assertThat(new Jedi("Yoda", "Blue")).hasSameHashCodeAs(new Jedi("Yoda", "Blue"));

 // assertions fail
 assertThat(42L).hasSameHashCodeAs(2501L);
 assertThat(null).hasSameHashCodeAs("The Force");
 assertThat("The Force").hasSameHashCodeAs("Awakens");
        Specified by:
        hasSameHashCodeAs in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the object to check hashCode against.
        Returns:
        this assertion object.

      • doesNotHaveSameHashCodeAs

        public SELF doesNotHaveSameHashCodeAs​(Object other)
        Verifies that the actual object does not have the same hashCode as the given object.

        Example: 

         // assertions succeed
 assertThat(42L).doesNotHaveSameHashCodeAs(2501L);
 assertThat("The Force").doesNotHaveSameHashCodeAs("Awakens");

 // assertions fail
 assertThat(42L).doesNotHaveSameHashCodeAs(42L);
 assertThat("The Force").doesNotHaveSameHashCodeAs("The Force");
 assertThat(new Jedi("Yoda", "Blue")).doesNotHaveSameHashCodeAs(new Jedi("Yoda", "Blue"));
        Specified by:
        doesNotHaveSameHashCodeAs in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Parameters:
        other - the object to check hashCode against.
        Returns:
        this assertion object.

      • newListAssertInstance

        protected <E> AbstractListAssert<?,​List<? extends E>,​E,​ObjectAssert<E>> newListAssertInstance​(List<? extends E> newActual)
        Create a AbstractListAssert from the given list.

        this method avoids code duplication when features like extracting/asList need to create a new list assertions.

        Type Parameters:
        E - the type of elements.
        Parameters:
        newActual - new list under test
        Returns:
        a new AbstractListAssert.

      • propagateAssertionInfoFrom

        private void propagateAssertionInfoFrom​(AbstractAssert<?,​?> assertInstance)

      • extracting

        protected <ASSERT extends AbstractAssert<?,​?>> ASSERT extracting​(String propertyOrField,
                                                                       AssertFactory<Object,​ASSERT> assertFactory)
        Extracts the value of given field/property from the object under test and creates a new assertion object using the given assert factory.

        If the object under test is a Map, the propertyOrField parameter is used as a key to the map.

        Nested field/property is supported, specifying "address.street.number" is equivalent to get the value corresponding to actual.getAddress().getStreet().getNumber()

        Private field can be extracted unless you call Assertions.setAllowExtractingPrivateFields(false).

        Type Parameters:
        ASSERT - the type of the resulting Assert
        Parameters:
        propertyOrField - the property/field to extract from the initial object under test
        assertFactory - the factory for the creation of the new Assert
        Returns:
        the new Assert instance
        Since:
        3.16.0
        See Also:
        AbstractObjectAssert.extracting(String), AbstractObjectAssert.extracting(String, InstanceOfAssertFactory)