def test_util_diffuse_underovercast_no_error(self):
        try:
            util.diffuse_underovercast(self.lat, self.lon, self.aware)
        except NoTimeZoneInfoError:
            self.fail("""'NoTimeZoneInfoError' should not be raised \
as 'datetime' object is tz-aware.""")
 def test_util_diffuse_underovercast_raise_error(self):
     with self.assertRaises(NoTimeZoneInfoError):
         util.diffuse_underovercast(self.lat, self.lon, self.unaware)