AbstractFuture<String> future = new AbstractFuture<String>() {};
    future.cancel(false);
    assertThat(future.tryInternalFastPathGetFailure()).isNull();
  }

  public void testForwardExceptionFastPath() throws Exception {
    class FailFuture extends InternalFutureFailureAccess implements ListenableFuture<String> {
      Throwable failure;

      FailFuture(Throwable throwable) {