Unittests MagicMock 不会在调用时返回值

Question

I wonder why my code doesn't work properly:

class UtilsUnittests(TestCase):
    
    def setUp(self) -> None:
        # Mock LinearMetricsClient
        self.patcher_metrics_client = patch('src.utils.Client')
        self.mock_metrics_client = self.patcher_metrics_client.start()
        self.mock_metrics_client.create = MagicMock(return_value=(200,{}))

    def tearDown(self) -> None:
        self.patcher_metrics_client.stop()

    def test_get_report_data__successful(self):
        data = get_report_data(arg_1, arg_2)

On call it will raise:

ValueError: not enough values to unpack (expected 2, got 0)

On call it return just MagicMock object instead of the 200, {}

utils.py file:

from external_lib.http_clients import Client

def get_report_data(report_query_params, obj_id):
    metrics_client = Client(obj_id)

    code, response_body = metrics_client.create(report_query_params, '/search')
    response_body = json.loads(response_body)
    ...

When I print output of metrics_client.create(report_query_params, '/search') it returns: ___<MagicMock name='Client().create()' id='4337409232'>

Structure is

|- src
|--- src/utils.py
|- tests
|--- tests/test_main.py

Answer 1

As @mrBeanBremen suggested, I have changed the code a little to return_value logic:

    class UtilsUnittests(TestCase):
    
    def setUp(self) -> None:
        # Mock LinearMetricsClient
        self.patcher_metrics_client = patch('src.utils.Client')
        self.mock_metrics_client = self.patcher_metrics_client.start()
        self.mock_metrics_client.return_value.create.return_value = MagicMock(return_value=(200,{}))

    def tearDown(self) -> None:
        self.patcher_metrics_client.stop()

    def test_get_report_data__successful(self):
        data = get_report_data(arg_1, arg_2)