Please teach me how to use `EnableTestAssistant` and `EnamlTestAssistant` correctly. I left these tests blank because I didn't get anywhere after fiddling with things for a hour.

The problem, so far as I can tell when running these tests on OS X, is that the widget is not resizing to fill the window. If the widget is not a known size it's prohibitively difficult to write a test which does anything meaningful.