verify(true);
  }

  public void testVerify_simple_failure() {
    try {
      verify(false);
      fail();
    } catch (VerifyException expected) {
    }
  }

  public void testVerify_simpleMessage_success() {
    verify(true, "message");
  }

  public void testVerify_simpleMessage_failure() {
    try {
      verify(false, "message");
      fail();

   * reading, such as an {@code InputStream}. Unlike with writable resources, there's no chance that
   * a failure that occurs when closing the stream indicates a meaningful problem such as a failure
   * to flush all bytes to the underlying resource.
   *
   * @param inputStream the input stream to be closed, or {@code null} in which case this method
   *     does nothing

   *   try {
   *     foo.bar();
   *   } catch (BarException | RuntimeException | Error t) {
   *     failure = t;
   *   }
   * }
   * if (failure != null) {
   *   throwIfInstanceOf(failure, BarException.class);
   *   throwIfUnchecked(failure);
   *   throw new AssertionError(failure);
   * }
   * </pre>
   *
   * @since 20.0
   */
  @GwtIncompatible // Class.cast, Class.isInstance

   *   try {
   *     foo.bar();
   *   } catch (BarException | RuntimeException | Error t) {
   *     failure = t;
   *   }
   * }
   * if (failure != null) {
   *   throwIfInstanceOf(failure, BarException.class);
   *   throwIfUnchecked(failure);
   *   throw new AssertionError(failure);
   * }
   * </pre>
   *
   * @since 20.0
   */
  @GwtIncompatible // Class.cast, Class.isInstance

     *
     * - _shouldn't_ be null, so we don't annotate it with @Nullable
     *
     * - _can_ be null without causing a runtime failure (because we don't want the interesting
     *   details of precondition failure to be hidden by an exception we throw about an unexpectedly
     *   null _failure message_)
     *
     * That combination upsets NullPointerTester, which wants any call that passes null for a

 *     Guava 27.0
 */
public final class InternalFutures {
  /**
   * Usually returns {@code null} but, if the given {@code Future} has failed, may <i>optionally</i>
   * return the cause of the failure. "Failure" means specifically "completed with an exception"; it
   * does not include "was cancelled." To be explicit: If this method returns a non-null value,
   * then:
   *
   * <ul>

    @Nullable private String value = null;
    @Nullable private Throwable failure = null;
    private boolean wasCalled = false;

    MockCallback(String expectedValue) {
      this.value = expectedValue;
    }

    public MockCallback(Throwable expectedFailure) {
      this.failure = expectedFailure;
    }

    @Override
    public synchronized void onSuccess(String result) {

  }

  public void testCheckNoOverflow_failure() {
    try {
      MathPreconditions.checkNoOverflow(false, "testCheckNoOverflow_failure", 0, 0);
      fail();
    } catch (ArithmeticException expected) {
      assertThat(expected).hasMessageThat().contains("testCheckNoOverflow_failure(0, 0)");
    }
  }

  public void testNulls() {
    /*

    @Override
    protected void doStart() {
      notifyFailed(new IllegalStateException("start failure"));
    }
  }

  private static class FailRunService extends NoOpService {
    @Override
    protected void doStart() {
      super.doStart();
      notifyFailed(new IllegalStateException("run failure"));
    }
  }

  private static class FailStopService extends NoOpService {
    @Override

              ? (isBoolean(method) ? Outcome.FAILURE : Outcome.HANG)
              : Outcome.SUCCESS);
      addTests(
          suite,
          method,
          Scenario.UNSATISFIED_AND_UNOCCUPIED_BEFORE_ENTERING,
          TimeoutsToUse.INFINITE,
          isGuarded(method)
              ? (isTryEnter(method) || isEnterIf(method) ? Outcome.FAILURE : Outcome.HANG)
              : Outcome.SUCCESS);