def METHOD_NAME(self):
    """Test that sending an empty dictionary of key-value pairs
    succeeds but does nothing.
    """
    headers = {"Content-Type" : ProfileController.MEDIA_TYPE}
    expected_new_state = dict(self.storage.writable_settings)
    body, status_code, headers = self.controller.put(
        headers, json.dumps({})
    )
    assert 200 == status_code
    assert expected_new_state == self.storage.writable_settings