},
            executor);
    assertDerivingThrowsIllegalStateException(closingFuture);
    assertFinalStepThrowsIllegalStateException(closingFuture);
  }

  public void testCatchingAsync_preventsFurtherOperations() {
    ClosingFuture<String> closingFuture = ClosingFuture.from(immediateFuture("value1"));
    ClosingFuture<String> unused =
        closingFuture.catchingAsync(
            Exception.class,