assertThat(successCalls[0]).isEqualTo(1);
    assertThat(failureCalls[0]).isEqualTo(0);
  }

  public void testOnSuccessThrowsError() throws Exception {
    SomeError error = new SomeError();
    String result = "result";
    SettableFuture<String> future = SettableFuture.create();
    int[] successCalls = new int[1];
    int[] failureCalls = new int[1];
    FutureCallback<String> callback =

  // We're testing that the method is in fact equivalent to throwing the exception directly.
  @SuppressWarnings("ThrowIfUncheckedKnownUnchecked")
  public void testThrowIfUnchecked_error() {
    assertThrows(SomeError.class, () -> throwIfUnchecked(new SomeError()));
  }

  @SuppressWarnings("ThrowIfUncheckedKnownChecked")
  public void testThrowIfUnchecked_checked() {
    throwIfUnchecked(new SomeCheckedException());
  }

  @J2ktIncompatible

    ListenableFuture<Object> input = UncheckedThrowingFuture.throwingError(new SomeError());

    // We'd catch only SomeError.class here, but then the test won't compile under GWT.
    ListenableFuture<Object> output =
        catching(input, Throwable.class, identity(), directExecutor());
    assertThat(getDone(output)).isInstanceOf(SomeError.class);
  }

  public void testCatching_listenerThrowsError() throws Exception {

    ListenableFuture<Object> input = UncheckedThrowingFuture.throwingError(new SomeError());

    // We'd catch only SomeError.class here, but then the test won't compile under GWT.
    ListenableFuture<Object> output =
        catching(input, Throwable.class, identity(), directExecutor());
    assertThat(getDone(output)).isInstanceOf(SomeError.class);
  }

  public void testCatching_listenerThrowsError() throws Exception {