public void updateCategory_invalidValidRequest_nullWidgetToUpdate(){
Model model = new ExtendedModelMap();
User user = new UserImpl();
long id = 1L;
String categoryText = "Social";
CategoryImpl category = new CategoryImpl();
category.setCreatedUser(user);
category.setText(categoryText);
category.setId(id);
SessionStatus sessionStatus = createMock(SessionStatus.class);
expect(userService.getAuthenticatedUser()).andReturn(user).once();
expect(categoryService.get(id)).andReturn(null).once();
replay(userService, categoryService);
String view = controller.updateCategory(category, validToken, validToken, model, sessionStatus);