python 如何模拟一个方法？

Question

我想测试一个httppost方法，这个方法会调用一些服务，但是这个服务不能在本地测试机上运行，所以我想模拟它。

test.py:

@route(bp, '/count', methods=['POST'])
def count():
   from module import service
   ...
   total, ids = service(id, page, count) // total is a integer, ids is a list.
   ...
   return {'total': total, 'ids': ids}

测试用例：

@mock.patch("module.service")
def test_search_user(self, mock_service):
    mock_service.return_value=(1, [])

    url = url_for('users.count')
    params = { .... }

    response = self._test_app.post_json(
        url, params, headers=self.request_headers, expect_errors=True)

    self.assertEqual(response.status_code, 200)

但是测试用例总是失败，它试图调用service方法，但它不能在我的机器上运行。我只是想嘲笑它，但不起作用。

任何人都可以帮助我！提前致谢！

根据@syntonym的回答，我的测试用例应该这样写：

@mock.patch("test.service")
def test_search_user(self, mock_service):
    mock_service.return_value=(1, [])

Answer 1

@mock.patch 实际上采用查找名称 - 而不是您要修补的对象实际所在的位置。 The documentation reads:

patch() works by (temporarily) changing the object that a name points to with another one. [...] The basic principle is that you patch where an object is looked up, which is not necessarily the same place as where it is defined.

python 如何模拟一个方法？

python how to mock a method?

python

patch

mocking