def test_activation_invalid_key(self):
        self.failIf(RegistrationProfile.objects.activate_user('foo'))
Given a dictionary of edge -> dependencies representing a DAG, "invert"
dataset/ETHPy150Open macropin/django-registration/registration/tests/models.py/RegistrationModelTests.test_activation_invalid_key--crossover with--dataset/ETHPy150Open enthought/depsolver/depsolver/utils.py/_invert_dependencies