requests_mock fixture with unittest library?

Question

I need to mock requests library, so figured to use requests_mock library for that. Though I wonder how can I create a fixture for my test class when using unittest library?

I can do this with testtools, like:

import testtools
from requests_mock.contrib import fixture

class MyTestCase(testtools.TestCase):
    TEST_URL = 'http://some-not-existing-url.com'

    def setUp(self):
        super().setUp()
        self.requests_mock = self.useFixture(fixture.Fixture())
        self.requests_mock.post(self.TEST_URL, status_code='200')

    def test_01_method(self):
        resp = requests.post(self.TEST_URL)
        self.assertEqual('200', resp.status_code)

Now unittest does not have useFixture method. Is there some equivalent in unittest lib? Or I need to use some different approach there?

Trying similar thing (without useFixture, crashes tests):

import unittest
from requests_mock.contrib import fixture

class MyTestCase(unittest.TestCase):
    TEST_URL = 'http://some-not-existing-url.com'

    def setUp(self):
        super().setUp()
        self.requests_mock = fixture.Fixture()
        self.requests_mock.post(self.TEST_URL, status_code='200')

    def test_01_method(self):
        resp = requests.post(self.TEST_URL)
        self.assertEqual('200', resp.status_code)

Running with unittest, I get [Errno -2] Name or service not known, which clearly shows that mocking does not apply correctly.

P.S. I need unittest lib, because it is used in framework which I use. So I need to incorporate these unittests to align with that framework.

Answer 1

Rather than using a fixture, you can explicitly start the mock in setUp and stop it in tearDown.

For example:

import unittest
import requests_mock
import requests

class MyTestCase(unittest.TestCase):
    TEST_URL = 'http://some-not-existing-url.com'

    def setUp(self):
        super().setUp()
        self.requests_mock = requests_mock.Mocker()
        self.requests_mock.post(self.TEST_URL, status_code='200')
        self.requests_mock.start()

    def test_01_method(self):
        resp = requests.post(self.TEST_URL)
        self.assertEqual('200', resp.status_code)

    def tearDown(self):
        super().tearDown()
        self.requests_mock.stop()