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
