}

  @SuppressWarnings("FutureTransformAsync") // We intentionally test transformAsync.
  public void testTransformAsync_genericsWildcard_asyncFunction() throws Exception {
    ListenableFuture<?> nullFuture = immediateVoidFuture();
    ListenableFuture<?> chainedFuture =
        transformAsync(nullFuture, x -> immediateFuture("hi"), directExecutor());
    assertThat(getDone(chainedFuture)).isEqualTo("hi");

  }

  @SuppressWarnings("FutureTransformAsync") // We intentionally test transformAsync.
  public void testTransformAsync_genericsWildcard_asyncFunction() throws Exception {
    ListenableFuture<?> nullFuture = immediateVoidFuture();
    ListenableFuture<?> chainedFuture =
        transformAsync(nullFuture, x -> immediateFuture("hi"), directExecutor());
    assertThat(getDone(chainedFuture)).isEqualTo("hi");

        };
    return derive(state.future.transformAsync(applyFunction, executor));
  }

  /**
   * Returns an {@link AsyncClosingFunction} that applies an {@link AsyncFunction} to an input,
   * ignoring the DeferredCloser and returning a {@code ClosingFuture} derived from the returned
   * {@link ListenableFuture}.
   *
   * <p>Use this method to pass a transformation to {@link #transformAsync(AsyncClosingFunction,