'Testing Scale() function on Z values.'

def test_scale(self):

    self._load_city_data()
    zscales = ((-3), 4, 23)
    for zscale in zscales:
        for city in City3D.objects.annotate(scale=Scale('point', 1.0, 1.0, zscale)):
            self.assertEqual((city_dict[city.name][2] * zscale), city.scale.z)
