def test_get_new_user_id_Returns_correct_user_id(self, mock_read_users_file): mock_read_users_file.return_value = { "0": { "name": "*****@*****.**", "Trust": 100, "SpamN": 0, "HamN": 20, "Date_of_first_seen_message": 1596848266.0, "Date_of_last_seen_message": 1596848266.0, "Groups": ["default"], }, "1": { "name": "*****@*****.**", "Trust": 100, "SpamN": 0, "HamN": 20, "Date_of_first_seen_message": 1596848266.0, "Date_of_last_seen_message": 1596848266.0, "Groups": ["default"], } } crud = CRUD() self.assertEqual(crud.get_new_user_id(), "2")