'Asserts that the time zone is a valid pytz time zone'

def _assert_time_zone_is_valid(self, time_zone_info):

    time_zone_name = time_zone_info['time_zone']
    self.assertIn(time_zone_name, common_timezones_set)
    self.assertEqual(time_zone_info['description'], get_display_time_zone(time_zone_name))
