def METHOD_NAME(self):
    """ Changes to the Controller singleton should be preserved across calls to get_instance() """
    # Initialize the instance and verify that it read the config settings
    controller = Controller.get_instance()
    assert controller.unverified_address is None
    # Change a value in the instance...
    controller.unverified_address = "123abc"
    # ...get a new copy of the instance and confirm change
    controller = Controller.get_instance()
    assert controller.unverified_address == "123abc"