Intro to Python Mocks #2: Mocking Exceptions | Python tutorial

[@charlietodd2867]

This is a great start to my journey. Security note: the nose module is no longer being maintained and should not be used. Use nose2 if you must, but the preference is to move to pytest.

[@zakchips]

Great. Thanks a lot. Very useful and underestimated topic, especially for those who's just found a job as a developer. Looking forward for more.

[@RedEyedCoderClub]

Thank you, Tatjana!

[@RedEyedCoderClub]

What video should I make next? Any suggestions?
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Timecodes:
00:00 - Beginning. Adding try/except block to the function under test
02:19 - How to raise an exception from a test, and how to mock an exception using the .side_effect property.
04:23 - Fixing the 'TypeError: catching classes that are not inherit from BaseException is not allowed' when mocking an exception.
07:03 - Using the .raise_for_status() function from the requests library
09:48 - Writing a test to test raise_for_status(), and mocking raise_for_status
13:32 - Checking status codes within an except clause of the try/except block.
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[@serg_D]

Satisfied with your explanations for the lesson. I have not met a better explanation.

[@RedEyedCoderClub]

Thanks for comment!

[@ДанилКочетков-ы1в]

This is an interesting video. For more of these in UA-cam 👍👍👍

[@RedEyedCoderClub]

Thanks you!

[@oliveratkinson913]

Learn with your help the possibilities of Python Mock, get acquainted with the Requests library, using functions is a good opportunity to broaden your horizons and professionalism

[@RedEyedCoderClub]

Thanks for comment!

[@ВладимирШалун]

Great video. Everything is clear and accessible.

[@RedEyedCoderClub]

Thanks for comment!

[@zzygyx9119]

awesome video. Thanks! Just wonder why in the end you used nosetests.

[@ВиталинаСмоленск]

Everything is smart and understandable. Thank you for the video.

[@RedEyedCoderClub]

Thanks for comment!

[@SayamKumar-ci9sg]

Loved the video. Thanks

[@АлексейЛешов-е7у]

Excellent instructional video.

[@RedEyedCoderClub]

Thanks for comment!

[@ОльгаЛебедева-ц1в]

Thank you. Your video helped me figure everything out.

[@RedEyedCoderClub]

Thanks for comment!

[@МаринаПеткова-у9м]

Great video tutorial and explanation. Thank you for the wonderful material.

[@RedEyedCoderClub]

Thank you!

[@ЛарисаАфаринова]

It's something with something. 👍👍👍

[@RedEyedCoderClub]

Thanks for comment!

[@kostya9169]

Thank you very much for the interesting and informative video.

[@RedEyedCoderClub]

Thank you!

[@liliaharchikova9365]

Cool. Everything is clear and understandable.

[@RedEyedCoderClub]

Thank you

[@Инна-х8к]

This information is really useful to me.

[@RedEyedCoderClub]

Thanks for comment

[@АнатолийРожков-ю8е]

All clear. Great lesson.

[@RedEyedCoderClub]

Thanks for comment!

[@olyfomina9927]

Great job thanks for it, your video lesson helped me a lot!! Good luck to you!!!

[@RedEyedCoderClub]

Thank you!

[@avbolshakov]

Thank you, Oleg!

[@RedEyedCoderClub]

Thanks for watching!

[@АнтонинаХохлова-с5н]

it was interesting, thanks for the video.

[@RedEyedCoderClub]

Thanks for comment!

[@brahimboughanem208]

I want to thank you. I was really struggling to grasp the concept of mocking subjects, and your videos have made it so much easier for me to understand

[@OlegBosi]

Very gooooood

[@RedEyedCoderClub]

Thank you!

[@RishinderRana]

Very helpful!

[@RedEyedCoderClub]

Thanks for the comment!

[@ygr4943]

شكرا ❤❤

[@WilliamPatiño-p7m]

Que buen video

[@andreylagno2372]

very good video

[@RedEyedCoderClub]

Thank you!

[@dodokwak]

Thank you!

[@RedEyedCoderClub]

Thanks for comment!

[@jhosagidpirelapineda7808]

thank you.

[@RedEyedCoderClub]

Thanks for watching, and for the comment!

[@prateeksarangi9187]

thanks 👍

[@RedEyedCoderClub]

Thanks for watching!

[@dodokwak]

Bedankt

[@RedEyedCoderClub]

Thanks for support!

[@ИванИванов-н9т9ъ]

А можно я не буду выпендриваться и задам вопрос на русском?
Олег, почему Вы не используете pytest?

[@RedEyedCoderClub]

Я не говорил, что я не использую pytest. Нет пока ни одного видео про pytest - вот это да.

[@vanderfed]

Two comments about the code presented:
1. It's a very bad practice to use structures like "except SomeException: pass". That's how you can make exceptions untraceable and very difficult to debug.
2. If you mock not "main.requests" but "main.requests.get" you can get rid of all the fuzz about mocking raise_for_status. It is so much better to mock actually what you need to mock specifically than the whole requests library

[@krishanunayek785]

It is really Beautiful explanation. You helped me a lot. I have written few of my testcases following your video. I was trying to implement the retry logic for http errors (500,502,503,504) and also the unit test cases for the retry logic for the http errors . i have also recently joined your telegram channel. I am giving my test code here below. Could you please have a look and suggest.
def func1(url):
s = auth_session(scopes=full_url) # auth_session function returns a authenticated session object as s.
retries = Retry(total=5, backoff_factor=1, status_forcelist=[500, 502, 503, 504])
s.mount('', HTTPAdapter(max_retries=retries))
res = s.get(url)
res.func1()
====
@patch('app.func1')
def test_retry_api_call_for_http_err(self, mock_session):
# mock_session.exceptions = Session.exceptions
mock_response = MagicMock(status_code=502)
mock_response.raise_for_status.side_effect=HTTPError("Invalid response")
mock_session.get.return_value=mock_response
res=retry_api_call('example.com/')
self.assertEqual(mock_session.get.call_count, 2) # it is returning Assertion Error : 0 != 2
self.assertEqual(res.status_code,502) # it is returning Assertion Error : 200 != 502