Package org.assertj.core.api

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

    • Constructor Detail

      • AbstractAssert

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

    • Method Detail

      • failWithMessage

        protected void failWithMessage​(String errorMessage,
                               Object... arguments)
        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 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.

      • 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.

      • as

        public SELF as​(String description,
               Object... args)
        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 a bad 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] expected:<[33]> but was:<[50]>");
 }
        Specified by:
        as in interface Descriptable<SELF extends AbstractAssert<SELF,​ACTUAL>>
        Parameters:
        description - the new description to set.
        args - optional parameter if description is a format String.
        Returns:
        this object.
        See Also:
        Descriptable.describedAs(String, Object...)

      • as

        public SELF as​(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:
        as in interface Descriptable<SELF extends AbstractAssert<SELF,​ACTUAL>>
        Parameters:
        description - the new description to set.
        Returns:
        this object.
        See Also:
        Descriptable.describedAs(Description)

      • 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​(String description,
                        Object... args)
        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 AbstractAssert<SELF,​ACTUAL>>
        Parameters:
        description - the new description to set.
        Returns:
        this 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.

      • isEqualTo

        public SELF isEqualTo​(Object expected)
        Verifies that the actual value is equal to the given one.

        Example: 

         // assertions will pass
 assertThat("abc").isEqualTo("abc");
 assertThat(new HashMap<String, Integer>()).isEqualTo(new HashMap<String, Integer>());
 
 // assertions will 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 will pass
 assertThat("abc").isNotEqualTo("123");
 assertThat(new ArrayList<String>()).isNotEqualTo(1);
 
 // assertions will 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 will pass
 assertThat(value).isNull();
 
 // assertions will 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: 

         // assertion will pass
 assertThat("abc").isNotNull();
 assertThat(new HashMap<String, Integer>()).isNotNull();
 
 // assertion will fail
 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.

        Example: 

         Ring[] elvesRings = new Ring[] { vilya, nenya, narya };
 
 // assertion will pass:
 assertThat(nenya).isIn(elvesRings);
 
 // assertion will fail:
 assertThat(oneRing).isIn(elvesRings);
        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.

        Example: 

         Ring[] elvesRings = new Ring[] { vilya, nenya, narya };
 
 // assertion will pass:
 assertThat(oneRing).isNotIn(elvesRings);
 
 // assertion will fail:
 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 values.

        Example: 

         Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);
 
 // assertion will pass:
 assertThat(nenya).isIn(elvesRings);
 
 // assertion will fail:
 assertThat(oneRing).isIn(elvesRings);
        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 values.

        Example: 

         Iterable<Ring> elvesRings = newArrayList(vilya, nenya, narya);
 
 // assertion will pass:
 assertThat(oneRing).isNotIn(elvesRings);
 
 // assertion will fail:
 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.

      • isInstanceOf

        public SELF isInstanceOf​(Class<?> type)
        Verifies that the actual value is an instance of the given type.

        Example: 

         // assertions will pass
 assertThat("abc").isInstanceOf(String.class);
 assertThat(new HashMap<String, Integer>()).isInstanceOf(HashMap.class);
 assertThat(new HashMap<String, Integer>()).isInstanceOf(Map.class);
 
 // assertions will 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>
        Parameters:
        type - the type to check the actual value against.
        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 will pass
 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 will 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 will pass
 assertThat(1).isNotInstanceOf(Double.class);
 assertThat(new ArrayList<String>()).isNotInstanceOf(LinkedList.class);
 
 // assertions will 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 will pass
 assertThat(1).isNotInstanceOfAny(Double.class, Float.class);
 assertThat(new ArrayList<String>()).isNotInstanceOfAny(LinkedList.class, Vector.class);
 
 // assertions will 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 will pass
 assertThat(1).hasSameClassAs(2);
 assertThat("abc").hasSameClassAs("123");
 assertThat(new ArrayList<String>()).hasSameClassAs(new ArrayList<Integer>());
 
 // assertions will 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 : 

         CartoonCaracter homer = new CartoonCaracter("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.

      • doesNotHaveSameClassAs

        public SELF doesNotHaveSameClassAs​(Object other)
        Verifies that the actual value does not have the same class as the given object.

        Example: 

         // assertions will pass
 assertThat(1).doesNotHaveSameClassAs("abc");
 assertThat(new ArrayList<String>()).doesNotHaveSameClassAs(new LinkedList<String>());
 
 // assertions will 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 will pass
 assertThat("abc").isExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isExactlyInstanceOf(ArrayList.class);
 assertThat(new HashMap<String, Integer>()).isExactlyInstanceOf(HashMap.class);
 
 // assertions will 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 will pass
 assertThat(1).isNotExactlyInstanceOf(String.class);
 assertThat(new ArrayList<String>()).isNotExactlyInstanceOf(List.class);
 assertThat(new HashMap<String, Integer>()).isNotExactlyInstanceOf(Map.class);
 
 // assertions will 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 will pass
 assertThat(new HashMap<String, Integer>()).isOfAnyClassIn(HashMap.class, TreeMap.class);
 assertThat(new ArrayList<String>()).isOfAnyClassIn(ArrayList.class, LinkedList.class);
 
 // assertions will 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 will pass
 assertThat(new HashMap<String, Integer>()).isNotOfAnyClassIn(Map.class, TreeMap.class);
 assertThat(new ArrayList<String>()).isNotOfAnyClassIn(LinkedList.class, List.class);
 
 // assertions will 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 will pass
 assertThat(sortedListAsObject).asList().isSorted();
 
 Object unsortedListAsObject = Arrays.asList(3, 1, 2);
 
 // assertion will fail
 assertThat(unsortedListAsObject).asList().isSorted();
        Specified by:
        asList in interface Assert<SELF extends AbstractAssert<SELF,​ACTUAL>,​ACTUAL>
        Returns:
        a list assertion object

      • asString

        public AbstractCharSequenceAssert<?,​String> asString()
        Verifies that the actual value is an instance of String, and returns a String assertion, to allow chaining of String-specific assertions from this call.

        Example : 

         Object stringAsObject = "hello world";

 // assertion will pass
 assertThat(stringAsObject).asString().contains("hello");
 
 // assertion will fail
 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.

        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.
        Throws:
        Exception - see String.format(String, Object...) exception clause.

      • usingComparator

        public SELF usingComparator​(Comparator<? super ACTUAL> customComparator)
        Use given custom comparator instead of relying on actual type A equals method 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 : 

         // 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 incoming assertion checks.
        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<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

      • setCustomRepresentation

        public static void setCustomRepresentation​(Representation customRepresentation)