def test_repr(self):
        gr = testlib.new_graph()
        gr_repr = repr(gr)
        assert isinstance(gr_repr, str )
        assert gr.__class__.__name__ in gr_repr
predicate which answers whether a username exists in the User db.
dataset/ETHPy150Open pmatiello/python-graph/tests/unittests-digraph.py/test_digraph.test_repr--crossover with--dataset/ETHPy150Open mekarpeles/waltz/waltz/__init__.py/User.registered