try {
      final SequentialExecutor executor = new SequentialExecutor(service);
      Runnable errorTask =
          new Runnable() {
            @Override
            public void run() {
              throw new MyError();
            }
          };
      Runnable barrierTask =
          new Runnable() {
            @Override
            public void run() {
              try {

  }

  @CanIgnoreReturnValue
  public B withSetUp(Runnable setUp) {
    this.setUp = setUp;
    return self();
  }

  public Runnable getSetUp() {
    return setUp;
  }

  @CanIgnoreReturnValue
  public B withTearDown(Runnable tearDown) {
    this.tearDown = tearDown;
    return self();
  }

  public Runnable getTearDown() {
    return tearDown;
  }

  // Features

    return NANOSECONDS.toMillis(System.nanoTime() - startNanoTime);
  }

  /** Returns a new started daemon Thread running the given runnable. */
  Thread newStartedThread(Runnable runnable) {
    Thread t = new Thread(runnable);
    t.setDaemon(true);
    t.start();
    return t;
  }

  /**
   * Waits for the specified time (in milliseconds) for the thread to terminate (using {@link

  }

  @CanIgnoreReturnValue
  public B withSetUp(Runnable setUp) {
    this.setUp = setUp;
    return self();
  }

  public Runnable getSetUp() {
    return setUp;
  }

  @CanIgnoreReturnValue
  public B withTearDown(Runnable tearDown) {
    this.tearDown = tearDown;
    return self();
  }

  public Runnable getTearDown() {
    return tearDown;
  }

  // Features

    @Override
    public void execute(Runnable runnable) {
      assertThat(runnable).isInstanceOf(TrustedListenableFutureTask.class);
      runnable.run();
    }

    @Override
    public void shutdown() {}

    @Override
    public List<Runnable> shutdownNow() {
      return ImmutableList.of();
    }

    @Override
    public boolean isShutdown() {
      return false;
    }

    @Override

    @Override
    public void execute(Runnable runnable) {
      assertThat(runnable).isInstanceOf(TrustedListenableFutureTask.class);
      runnable.run();
    }

    @Override
    public void shutdown() {}

    @Override
    public List<Runnable> shutdownNow() {
      return ImmutableList.of();
    }

    @Override
    public boolean isShutdown() {
      return false;
    }

    @Override

 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
public class AbstractTester<G> extends TestCase {
  private G subjectGenerator;
  private String suiteName;
  private @Nullable Runnable setUp;
  private @Nullable Runnable tearDown;

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void setUp() throws Exception {
    if (setUp != null) {
      setUp.run();
    }
  }

 */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
public class AbstractTester<G> extends TestCase {
  private G subjectGenerator;
  private String suiteName;
  private @Nullable Runnable setUp;
  private @Nullable Runnable tearDown;

  // public so that it can be referenced in generated GWT tests.
  @Override
  public void setUp() throws Exception {
    if (setUp != null) {
      setUp.run();
    }
  }

        runnables.poll().execute();
      }
    }

    private static class RunnableExecutorPair {
      final Runnable runnable;
      final Executor executor;

      RunnableExecutorPair(Runnable runnable, Executor executor) {
        this.runnable = runnable;
        this.executor = executor;
      }

      void execute() {
        try {
          executor.execute(runnable);

    try {
      final SequentialExecutor executor = new SequentialExecutor(service);
      Runnable errorTask =
          new Runnable() {
            @Override
            public void run() {
              throw new MyError();
            }
          };
      Runnable barrierTask =
          new Runnable() {
            @Override
            public void run() {
              try {