def test_init(self):
        mr = MetricsResponse('{"valid":"json"}')
        self.assertIsInstance(mr.metrics, dict)
        self.assertIsInstance(mr._raw, six.string_types)
returns None or string
dataset/ETHPy150Open andycasey/ads/ads/tests/test_metrics.py/TestMetricsResponse.test_init--crossover with--dataset/ETHPy150Open jart/fabulous/fabulous/widget.py/ProgressBar.get_message