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

This video is the second part of Python testing using Mocks series (or just Python Mocks). In this video we'll touch the mocking of exceptions topic, how to mock exceptions in Python, how to mock the .raise_for_status() function of the Requests library.
In this Python testing tutorial as an example I use a function that makes a request to external API. And as a testing library I use unittest.
It's a Python unittest mock tutorial for beginners.

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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.


Why Python mocks are important:
- Mocks eliminate dependency on network, database calls, calls to OS (it will speed testing)
- we get isolated unit tests,
- we can test methods that have no return value
- reduce test complexity. We don't have to write complex logic to handle behavior of methods under tests.
- don't have to wait to implement other methods.

When should you mock?
When you don't want to actually call an object


#1 Intro to Python Mocks | Python tutorial
https://youtu.be/xT4SV7AH3G8

#2 Intro to Python Mocks: Mocking Exceptions | Python tutorial
https://youtu.be/RqR0AvEujrU


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