@Override
              public Object answer(InvocationOnMock invocation) throws Throwable {
                forwardingListener.addListener((ControllerListener) invocation.getArguments()[0]);
                // NULLSAFE_FIXME[Return Not Nullable]
                return null;
              }
Stubs addControllerListener

@param controller
@return forwarding listener
drawee/src/test/java/com/facebook/drawee/testing/DraweeMocks.java