Package org.assertj.core.api

Class AbstractCompletableFutureAssert<SELF extends AbstractCompletableFutureAssert<SELF,RESULT>,RESULT>

java.lang.Object
org.assertj.core.api.AbstractAssert<SELF,CompletableFuture<RESULT>>
org.assertj.core.api.AbstractCompletableFutureAssert<SELF,RESULT>
Type Parameters:
RESULT - type of the value contained in the CompletableFuture.
All Implemented Interfaces:
Assert<SELF,CompletableFuture<RESULT>>, Descriptable<SELF>, ExtensionPoints<SELF,CompletableFuture<RESULT>>
Direct Known Subclasses:
CompletableFutureAssert
public abstract class AbstractCompletableFutureAssert<SELF extends AbstractCompletableFutureAssert<SELF,RESULT>,RESULT> extends AbstractAssert<SELF,CompletableFuture<RESULT>>
Assertions for CompletableFuture.

  • Constructor Details

  • Method Details

    • isDone

      public SELF isDone()
      Verifies that the CompletableFuture is done i.e. completed normally, exceptionally, or via cancellation.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something")).isDone();
      Assertion will fail : 
       assertThat(new CompletableFuture()).isDone();
      Returns:
      this assertion object.
      See Also:

    • isNotDone

      public SELF isNotDone()
      Verifies that the CompletableFuture is not done.

      Assertion will pass : 

       assertThat(new CompletableFuture()).isNotDone();
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something")).isNotDone();
      Returns:
      this assertion object.
      See Also:

    • isCompletedExceptionally

      public SELF isCompletedExceptionally()
      Verifies that the CompletableFuture is completed exceptionally.

      Possible causes include cancellation, explicit invocation of completeExceptionally, and abrupt termination of a CompletionStage action.

      Assertion will pass : 

       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException());
 assertThat(future).isCompletedExceptionally();
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something")).isCompletedExceptionally();
      Returns:
      this assertion object.
      See Also:

    • isNotCompletedExceptionally

      public SELF isNotCompletedExceptionally()
      Verifies that the CompletableFuture is not completed exceptionally.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something")).isNotCompletedExceptionally();
      Assertion will fail : 
       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException());
 assertThat(future).isNotCompletedExceptionally();
      Returns:
      this assertion object.
      See Also:

    • isCancelled

      public SELF isCancelled()
      Verifies that the CompletableFuture is cancelled.

      Assertion will pass : 

       CompletableFuture future = new CompletableFuture();
 future.cancel(true);
 assertThat(future).isCancelled();
      Assertion will fail : 
       assertThat(new CompletableFuture()).isCancelled();
      Returns:
      this assertion object.
      See Also:

    • isNotCancelled

      public SELF isNotCancelled()
      Verifies that the CompletableFuture is not cancelled.

      Assertion will pass : 

       assertThat(new CompletableFuture()).isNotCancelled();
      Assertion will fail : 
       CompletableFuture future = new CompletableFuture();
 future.cancel(true);
 assertThat(future).isNotCancelled();
      Returns:
      this assertion object.
      See Also:

    • isCompleted

      public SELF isCompleted()
      Verifies that the CompletableFuture is completed normally (i.e.done but not completed exceptionally) or cancelled.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something")).isCompleted();
      Assertion will fail : 
       assertThat(new CompletableFuture()).isCompleted();
      Returns:
      this assertion object.

    • isNotCompleted

      public SELF isNotCompleted()
      Verifies that the CompletableFuture is not completed normally (i.e. incomplete, failed or cancelled).

      Assertion will pass : 

       assertThat(new CompletableFuture()).isNotCompleted();
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something")).isNotCompleted();
      Returns:
      this assertion object.

    • isCompletedWithValue

      public SELF isCompletedWithValue(RESULT expected)
      Verifies that the CompletableFuture is completed normally with the expected result.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValue("something");
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValue("something else");
      Parameters:
      expected - the expected result value of the CompletableFuture.
      Returns:
      this assertion object.

    • isCompletedWithValueMatchingWithin

      public SELF isCompletedWithValueMatchingWithin(Predicate<RESULT> resultPredicate, Duration completionDuration)
      Verifies that the CompletableFuture will complete normally withing given Duration with a value that matches the given Predicate.

      Assertion succeeds: 

       assertThat(completedFuture("something")).isCompletedWithValueMatchingWithin(result -> result.equals("something"),
                                                                            Duration.ofSeconds(10));

      Assertions fail: 

       assertThat(failedFuture("something")).isCompletedWithValueMatchingWithin(result -> result.equals("something"),
                                                                         Duration.ofSeconds(10));
 Future futureCompletedAfterFiveSeconds = ... ;
 assertThat(futureCompletedAfterFiveSeconds).isCompletedWithValueMatchingWithin(result -> result.equals("something"),
                                                                                Duration.ofSeconds(10));
      Parameters:
      resultPredicate - the Predicate to apply.
      completionDuration - the maximum time to wait
      Returns:
      a new assertion object on the future's result.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture does not succeed within the given timeout with the satisfying value.

    • isCompletedWithValueMatching

      public SELF isCompletedWithValueMatching(Predicate<? super RESULT> predicate)
      Verifies that the CompletableFuture is completed normally with a result matching the predicate.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValueMatching(result -> result.equals("something"));
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValueMatching(result -> result.equals("something else"));
      Parameters:
      predicate - the Predicate to apply.
      Returns:
      this assertion object.

    • isCompletedWithValueMatching

      public SELF isCompletedWithValueMatching(Predicate<? super RESULT> predicate, String description)
      Verifies that the CompletableFuture is completed normally with a result matching the predicate, the String parameter is used in the error message.

      Assertion will pass : 

       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValueMatching(result -> result != null, "expected not null");
      Assertion will fail : 
       assertThat(CompletableFuture.completedFuture("something"))
           .isCompletedWithValueMatching(result -> result == null, "expected null");
      Error message is: 
       Expecting:
   <"something">
 to match 'expected null' predicate.
      Parameters:
      predicate - the Predicate to apply on the resulting value.
      description - the Predicate description.
      Returns:
      this assertion object.

    • hasFailed

      @Deprecated public SELF hasFailed()
      Deprecated.

      Combine isCompletedExceptionally with isNotCancelled instead: 

       assertThat(future).isCompletedExceptionally()
                   .isNotCancelled();
      This assertion is deprecated to change the semantics of failed to correspond to CompletableFuture.get() failing.

      Original javadoc

      Verifies that the CompletableFuture has completed exceptionally but has not been cancelled, this assertion is equivalent to: 

       assertThat(future).isCompletedExceptionally()
                   .isNotCancelled();

      Assertion will pass : 

       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException());
 assertThat(future).hasFailed();
      Assertion will fail : 
       CompletableFuture future = new CompletableFuture();
 future.cancel(true);
 assertThat(future).hasFailed();
      Returns:
      this assertion object.

    • hasNotFailed

      @Deprecated public SELF hasNotFailed()
      Deprecated.

      Use matches with the following combination instead: 

       assertThat(future).matches (f -> f.isNotCompletedExceptionally() || f.isCancelled());
      This assertion is deprecated because its semantic is not obvious.

      Original javadoc

      Verifies that the CompletableFuture has not failed i.e: incomplete, completed or cancelled.
      This is different from isNotCompletedExceptionally() as a cancelled future has not failed but is completed exceptionally.

      Assertion will pass : 

       CompletableFuture future = new CompletableFuture();
 future.cancel(true);
 assertThat(future).hasNotFailed();
      Assertion will fail : 
       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException());
 assertThat(future).hasNotFailed();
      Returns:
      this assertion object.

    • succeedsWithin

      public ObjectAssert<RESULT> succeedsWithin(Duration timeout)
      Waits if necessary for at most the given time for this future to complete, and then returns its result for further assertions.

      If the future's result is not available for any reason an assertion error is thrown.

      To get assertions for the future result's type use succeedsWithin(Duration, InstanceOfAssertFactory) instead.

      Examples: 

       CompletableFuture<String> future = CompletableFuture.completedFuture("ook!");
 Duration timeout = Duration.ofMillis(100);

 // assertion succeeds
 assertThat(future).succeedsWithin(timeout)
                   .isEqualTo("ook!");

 // fails assuming the future is not done after the given timeout
 CompletableFuture<String> future = ... ; // future too long to complete
 assertThat(future).succeedsWithin(timeout);

 // fails as the future is cancelled
 CompletableFuture future = new CompletableFuture();
 future.cancel(false);
 assertThat(future).succeedsWithin(timeout);
      Parameters:
      timeout - the maximum time to wait
      Returns:
      a new assertion object on the future's result.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture does not succeed within the given timeout.

    • newObjectAssert

      protected ObjectAssert<RESULT> newObjectAssert(RESULT objectUnderTest)

    • succeedsWithin

      public ObjectAssert<RESULT> succeedsWithin(long timeout, TimeUnit unit)
      Waits if necessary for at most the given time for this future to complete, and then returns its result for further assertions.

      If the future's result is not available for any reason an assertion error is thrown.

      To get assertions for the future result's type use succeedsWithin(long, TimeUnit, InstanceOfAssertFactory) instead.

      Examples: 

       CompletableFuture<String> future = CompletableFuture.completedFuture("ook!");

 // assertion succeeds
 assertThat(future).succeedsWithin(100, TimeUnit.MILLISECONDS)
                   .isEqualTo("ook!");

 // fails assuming the future is not done after the given timeout
 CompletableFuture<String> future = ... ; // future too long to complete
 assertThat(future).succeedsWithin(100, TimeUnit.MILLISECONDS);

 // fails as the future is cancelled
 CompletableFuture future = new CompletableFuture();
 future.cancel(false);
 assertThat(future).succeedsWithin(100, TimeUnit.MILLISECONDS);
      Parameters:
      timeout - the maximum time to wait
      unit - the time unit of the timeout argument
      Returns:
      a new assertion object on the future's result.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture does not succeed within the given timeout.

    • succeedsWithin

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT succeedsWithin(Duration timeout, InstanceOfAssertFactory<RESULT,ASSERT> assertFactory)
      Waits if necessary for at most the given time for this future to complete, the InstanceOfAssertFactory parameter is used to return assertions specific to the future's result type.

      If the future's result is not available for any reason an assertion error is thrown.

      Examples: 

       CompletableFuture<String> future = CompletableFuture.completedFuture("ook!");
 Duration timeout = Duration.ofMillis(100);

 // assertion succeeds
 // using asInstanceOf is recommended to get assertions for the future result's type
 assertThat(future).succeedsWithin(timeout, InstanceOfAssertFactories.STRING)
                   .contains("ok");

 // assertion fails if the narrowed type for assertions is incompatible with the future's result type.
 assertThat(future).succeedsWithin(timeout, InstanceOfAssertFactories.DATE)
                   .isToday();
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      timeout - the maximum time to wait
      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 CompletableFuture
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      IllegalStateException - if the actual CompletableFuture does not succeed within the given timeout.

    • succeedsWithin

      public <ASSERT extends AbstractAssert<?, ?>> ASSERT succeedsWithin(long timeout, TimeUnit unit, InstanceOfAssertFactory<RESULT,ASSERT> assertFactory)
      Waits if necessary for at most the given time for this future to complete, the InstanceOfAssertFactory parameter is used to return assertions specific to the future's result type.

      If the future's result is not available for any reason an assertion error is thrown.

      Examples: 

       CompletableFuture<String> future = CompletableFuture.completedFuture("ook!");

 // assertion succeeds
 // using asInstanceOf is recommended to get assertions for the future result's type
 assertThat(future).succeedsWithin(100, TimeUnit.MILLISECONDS, InstanceOfAssertFactories.STRING)
                   .contains("ok");

 // assertion  fails if the narrowed type for assertions is incompatible with the future's result type.
 assertThat(future).succeedsWithin(100, TimeUnit.MILLISECONDS, InstanceOfAssertFactories.DATE)
                   .isToday();
      Type Parameters:
      ASSERT - the type of the resulting Assert
      Parameters:
      timeout - the maximum time to wait
      unit - the time unit of the timeout argument
      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 CompletableFuture
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture does not succeed within the given timeout.

    • hasFailedWithThrowableThat

      @Deprecated public AbstractThrowableAssert<?,? extends Throwable> hasFailedWithThrowableThat()
      Deprecated.

      Although not 100% the same, consider using failsWithin(Duration) or failsWithin(long, TimeUnit) instead: 

       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException("boom!"));

 assertThat(future).failsWithin(1, TimeUnit.SECONDS)
                   .withThrowableOfType(RuntimeException.class)
                   .withMessage("boom!");
      This assertion is deprecated because it relies on hasFailed() semantics which we want to move away from (they are not clear!) and to use failure semantics corresponding to CompletableFuture.get() failing.

      Original javadoc

      Verifies that the CompletableFuture has completed exceptionally and returns a Throwable assertion object allowing to check the Throwable that has caused the future to fail.

      Assertion will pass : 

       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException("boom!"));

 assertThat(future).hasFailedWithThrowableThat().isInstanceOf(RuntimeException.class);
                                                .hasMessage("boom!");
      Assertion will fail : 
       CompletableFuture future = new CompletableFuture();
 future.completeExceptionally(new RuntimeException());

 assertThat(future).hasFailedWithThrowableThat().isInstanceOf(IllegalArgumentException.class);
      Returns:
      an exception assertion object.

    • failsWithin

      public WithThrowable failsWithin(Duration timeout)
      Checks that the future does not complete within the given time (by calling Future.get(long, TimeUnit)) and returns the exception that caused the failure for further (exception) assertions, the exception can be any of InterruptedException, ExecutionException, TimeoutException or CancellationException.

      WARNING

      failsWithin does not fully integrate with soft assertions, if the future completes the test will fail immediately (the error is not collected as a soft assertion error), if the assertion succeeds the chained assertions are executed and any errors will be collected as a soft assertion errors.
      The rationale is that if we collect failsWithin error as a soft assertion error, the chained assertions would be executed but that does not make sense since there is no exception to check as the future has completed.

      Examples: 

       CompletableFuture<?> future = futureCompletingAfterMs(100);

 // assertion succeeds as the future is not completed after 50ms
 assertThat(future).failsWithin(Duration.ofMillis(50))
                   .withThrowableOfType(TimeoutException.class)
                   .withMessage(null);

 // fails as the future is completed after within 200ms
 assertThat(future).failsWithin(Duration.ofMillis(200));
      Parameters:
      timeout - the maximum time to wait
      Returns:
      a new assertion instance on the future's exception.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture succeeds within the given timeout.
      Since:
      3.18.0

    • failsWithin

      public WithThrowable failsWithin(long timeout, TimeUnit unit)
      Checks that the future does not complete within the given time (by calling Future.get(long, TimeUnit)) and returns the exception that caused the failure for further (exception) assertions, the exception can be any of InterruptedException, ExecutionException, TimeoutException or CancellationException.

      WARNING

      failsWithin does not fully integrate with soft assertions, if the future completes the test will fail immediately (the error is not collected as a soft assertion error), if the assertion succeeds the chained assertions are executed and any errors will be collected as a soft assertion errors.
      The rationale is that if we collect failsWithin error as a soft assertion error, the chained assertions would be executed but that does not make sense since there is no exception to check as the future has completed.

      Examples: 

       CompletableFuture<?> future = futureCompletingAfterMs(100);

 // assertion succeeds as the future is not completed after 50ms
 assertThat(future).failsWithin(50, TimeUnit.MILLISECONDS)
                   .withThrowableOfType(TimeoutException.class)
                   .withMessage(null);

 // fails as the future is completed after within 200ms
 assertThat(future).failsWithin(200, TimeUnit.MILLISECONDS);
      Parameters:
      timeout - the maximum time to wait
      unit - the time unit
      Returns:
      a new assertion instance on the future's exception.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture succeeds within the given timeout.
      Since:
      3.18.0

    • completesExceptionallyWithin

      public WithThrowable completesExceptionallyWithin(Duration timeout)
      Checks that the future completes exceptionally within the given time (by calling Future.get(long, TimeUnit)) and returns the exception that caused the failure for further (exception) assertions. The exception can be ExecutionException or CancellationException.

      Examples: 

       CompletableFuture<Void> completableFuture = futureThrowingExceptionAfterMs(100);

 // assertion fails as the future is not completed (neither successfully nor exceptionally) within 1 ms
 assertThat(completableFuture).completesExceptionallyWithin(1, MILLISECONDS);

 // assertion succeeds as after a longer wait the future is completed with the expected exception
 assertThat(completableFuture).completesExceptionallyWithin(200, MILLISECONDS)
                              .withThrowableOfType(ExecutionException.class)
                              .withMessageContaining("boom!");
      Parameters:
      timeout - the maximum duration to wait
      Returns:
      a new assertion instance on the future's exception.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture succeeds or doesn't complete at all within the given timeout.
      Since:
      3.27.0

    • completesExceptionallyWithin

      public WithThrowable completesExceptionallyWithin(long timeout, TimeUnit unit)
      Checks that the future completes exceptionally within the given time (by calling Future.get(long, TimeUnit)) and returns the exception that caused the failure for further (exception) assertions. The exception can be ExecutionException or CancellationException.

      Examples: 

       CompletableFuture<Void> completableFuture = futureThrowingExceptionAfterMs(100);

 // assertion fails as the future is not completed (neither successfully nor exceptionally) within 1 ms
 assertThat(completableFuture).completesExceptionallyWithin(Duration.ofMillis(1));

 // assertion succeeds as after a longer wait the future is completed with the expected exception
 assertThat(completableFuture).completesExceptionallyWithin(Duration.ofMillis(200))
                              .withThrowableOfType(ExecutionException.class)
                              .withMessageContaining("boom!");
      Parameters:
      timeout - the maximum time to wait
      unit - the timeout unit
      Returns:
      a new assertion instance on the future's exception.
      Throws:
      AssertionError - if the actual CompletableFuture is null.
      AssertionError - if the actual CompletableFuture succeeds or doesn't complete at all within the given timeout.
      Since:
      3.27.0