'Fields are ordered based on their creation.'

def test_field_ordering(self):

    f1 = models.Field()
    f2 = models.Field(auto_created=True)
    f3 = models.Field()
    self.assertLess(f2, f1)
    self.assertGreater(f3, f1)
    self.assertIsNotNone(f1)
    self.assertNotIn(f2, (None, 1, ''))
