def METHOD_NAME(self):
    value_json = '["a", 1, {"_type": "date_isoformat",' '"value": "2017-04-19"}]'
    expected = ["a", 1, date(2017, 4, 19)]
    value = json.loads(value_json, cls=JobDecoder, env=self.env)
    self.assertEqual(value, expected)