def test_delete_by_name(self):
self.create_data()
# Delete existing users
for name in ["alice", "bob", "charlie"]:
UserManager.delete_by_name(name)
self.assertFalse(db.User.exists(name=name))
# Delete non-existent user
self.assertRaises(ObjectNotFound, UserManager.delete_by_name, "null")
