def test_make_unique_nickname(self): u = User(nickname='john', email='*****@*****.**') db.session.add(u) db.session.commit() nickname = User.make_unique_nickname('john') assert nickname != 'john' u = User(nickname=nickname, email='*****@*****.**') db.session.add(u) db.session.commit() nickname2 = User.make_unique_nickname('john') assert nickname2 != 'john' assert nickname2 != nickname