} finally {
      functionBlocking.countDown();
      executor.shutdown();
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // lazyTransform
  public void testLazyTransform() throws Exception {
    FunctionSpy<Object, String> spy = new FunctionSpy<>(x -> "bar");
    Future<String> input = immediateFuture("foo");
    Future<String> transformed = lazyTransform(input, spy);

    } finally {
      functionBlocking.countDown();
      executor.shutdown();
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // lazyTransform
  public void testLazyTransform() throws Exception {
    FunctionSpy<Object, String> spy = new FunctionSpy<>(x -> "bar");
    Future<String> input = immediateFuture("foo");
    Future<String> transformed = lazyTransform(input, spy);