@classmethod
    def get_username(cls, user):
        raise NotImplementedError('Implement in subclass')
Test with a completely unchanged definition.
dataset/ETHPy150Open omab/python-social-auth/social/storage/base.py/UserMixin.get_username--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/South-1.0.2/south/tests/autodetection.py/TestComparison.test_no_change