If I run the following code with pytest test.py I get the output {'status': 'success', 'data': 'Dave'}. Why is that?

from unittest.mock import patch, MagicMock


class MessageHandler:
 
    def success_response(self, data):
        return {'status': 'success', 'data': data}
 
    def error_response(self, message=None, exception=None):
        return {'status': 'error', 'data': message or str(exception)}


def create_db_if_it_doesnt_already_exists():
    return 'Dave'


def create_db() -> dict:
    msg = MessageHandler()
    result = None
    try:
        result = create_db_if_it_doesnt_already_exists()
    except Exception as e:
        return msg.error_response(exception=e)
    return msg.success_response(result)
 
 
def test_create_db_success():
    return_value = 'Dave'
    with patch('database.init_db.create_db_if_it_doesnt_already_exists') as mock_create_db:
        mock_create_db.return_value = return_value
 
        msg = MagicMock()
        msg.success_response = MagicMock(return_value={'status': 'success', 'data': return_value})
 
        with patch('common.messages.MessageHandler', return_value=msg):
 
            response = create_db()
 
            mock_create_db.assert_called_once()
            msg.success_response.assert_called_once_with(return_value)
            assert response == {'status': 'success', 'data': return_value}
 
 
def test_create_db_error():
    error_string = 'There was an error'
    exception_instance = Exception(error_string)
    with patch('database.init_db.create_db_if_it_doesnt_already_exists', side_effect=exception_instance) as mock_create_db_1:
        #mock_create_db.side_effect = exception_instance
 
        msg_1 = MagicMock()
        msg_1.error_response = MagicMock(return_value={'status': 'error', 'data': error_string})
 
        with patch('common.messages.MessageHandler', return_value=msg_1):
 
            response_1 = create_db()
            print(response_1)
 
            mock_create_db_1.assert_called_once()
            msg_1.error_response.assert_called_once()
            msg_1.error_response.assert_called_with(exception=exception_instance)
            assert response_1 == {'status': 'error', 'data': error_string}