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);
    spy.verifyCallCount(0);
    assertThat(getDone(transformed)).isEqualTo("bar");

      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);
    spy.verifyCallCount(0);
    assertThat(getDone(transformed)).isEqualTo("bar");

   * @since 10.0
   */
  @J2ktIncompatible
  @GwtIncompatible // TODO
  public static <I extends @Nullable Object, O extends @Nullable Object> Future<O> lazyTransform(
      Future<I> input, Function<? super I, ? extends O> function) {
    checkNotNull(input);
    checkNotNull(function);
    return new Future<O>() {

      @Override