GWT provides GWTMockUtilities which will disarm/restore calls to GWT.create so GWT can be tested using standard mocking frameworks such as EasyMock. How can I do the same for GXT widgets?

The problem seems to be the GXT class has static members which call GWT.getModuleBaseURL(), and that method is not disarmed like create is. Is there a way around this? I've tried modifing GWTBridge to contain this method but it seems the original one is always loaded before mine.