@Test
public void simpleCall() throws Exception {

  StashCallable<Integer, Integer> stashCallable = new StashCallable<>(1);
  Integer response = stashCallable.call(2, FakeCallContext.createDefault());
  Truth.assertThat(response).isEqualTo(Integer.valueOf(1));
  FakeCallContext callContext = (FakeCallContext) stashCallable.getContext();
  Truth.assertThat(callContext.getChannel()).isNull();
  Truth.assertThat(callContext.getCredentials()).isNull();
}