LayoutComposite requires that its wrapped widget implement RequiresResize

[nikp]

I have a widget which extends ResizeComposite, and I'm using the GwtMockitoTestRunner

The call inside the constructor initWidget(uiBinder.createAndBindUi(this)); fails with this exception because initWidget inside ResizeComposite has the following assert:

    assert widget instanceof RequiresResize :
      "LayoutComposite requires that its wrapped widget implement RequiresResize";

I have a feeling this is related to https://github.com/google/gwtmockito/issues/4, but perhaps not.

I realize uiBinder is a FakeUiBinder, but I think it should ensure that the mocks it returns do more than just initialize the UiFields, it should also ensure to implement all the original interfaces of the owner widget.

[ekuefler]

Could you show how you're setting up your UiBinder? This seems to work for me:

interface MyUiBinder extends UiBinder<DataGrid, MyClass> {}
private final MyUiBinder uiBinder = GWT.create(MyUiBinder.class);
MyClass() {
  initWidget(uiBinder.createAndBindUi(this));
}

However, it only works if I declare the UiBinder to extend UiBinder<DataGrid, MyClass>, not UiBinder<Widget, MyClass>. This makes sense, since if you declare it to return a widget there's no way for GwtMockito to know you need to implement RequiresResize. Any chance this is the problem, or am I misunderstanding?

While debugging this I did find an unrelated bug that GwtMockito wasn't handling UiBinders that return a generic type properly - I fixed that in 8706592b3be57d06a1e9f724f836f8bc98a39dc4 in case you run into it.

[nikp]

You are absolutely right, that is the difference!

Though your bug fix seems like it could be related too, because my UI binder was defined like:

interface MyViewImplUiBinder extends UiBinder<Widget, MyViewImpl<T>> {}