def METHOD_NAME(self):
    """
    Test that only one attribute of the same attribute type can be
    saved if the attribute type is unique
    """
    self.assertEqual(1, len(self.project.projectattribute_set.all()))
    proj_attr_type = ProjectAttributeType.objects.get(name='Account Number')
    new_attr = ProjectAttribute(project=self.project, proj_attr_type=proj_attr_type)
    with self.assertRaises(ValidationError):
        new_attr.clean()