@Test public void wrapFuture_futureIsUnexpectedCheckedException_idempotence() throws Exception {

  MyException exception = new MyException("test");
  CompletionStage<?> stage =
      Maybe.catchException(IOException.class, exceptionally(exception));
  stage = Maybe.catchException(IOException.class, stage);
  stage = Maybe.catchException(MyUncheckedException.class, stage);
  assertCauseOf(ExecutionException.class, stage).isSameAs(exception);
}