Why requests raise_for_status() not called using pytest

There is a class and a method _get_authorize_token

    class StsAPI:
    
        def _get_authorize_token(self) -> str:
            try:
                resp = requests.post(settings.AUTHORIZATION_SERVICE_URL, json=self.data)
                print(resp.status_code)
                resp.raise_for_status()
                result = resp.json()
            except requests.exceptions.HTTPError:
                raise Exception('Not authorized')
            return result.get('token', {})

sts_api = StsAPI()

And a test case for _get_authorize_token

def test_raise_exception_if_request_error(
    requests_mock,
    mocker
):
    requests_mock.return_value = mocker.Mock(status_code=500)
    client = sts_api
    with pytest.raises(Exception, match='Not authorized'):
        client._get_authorize_token()

@pytest.fixture
def requests_mock(mocker):
    return mocker.patch('project.logic.connector.requests.post')

Test result

>       with pytest.raises(Exception, match='Not authorized'):
E       Failed: DID NOT RAISE <class 'Exception'>

the print(resp.status_code) line returns status 500. Based on this I assume raise_for_status should give an error.

If change the logic to

def _get_authorize_token(self) -> str:
    resp = requests.post(settings.AUTHORIZATION_SERVICE_URL, json=self.data)
    if resp.status_code != 200:
        raise Exception('Not authorized')
    return resp

Then the test is successful

>Solution :

Since you mocked the response, accessing the raise_for_status attribute simply returns a new mock, rather than getting the actual raise_for_status method of a real response. Just like you configured the mock to produce a status_code of 500, you need to configure it to produce a method that raises the exception you expect on a status code of 500. Something like

def _raise_exception(*args):
    raise HTTPError()

requests_mock.return_value = mocker.Mock(status_code=500, raise_for_status=_raise_exception)

Now when your code-under-test calls resp.raise_for_status, your _raise_exception function will be called.