Clean Code in Python

unittest

The unittest module is a great option with which to start writing unit tests because it provides a rich API to write all kinds of testing conditions, and since it's available in the standard library, it's quite versatile and convenient.

The unittest module is based on the concepts of JUnit (from Java), which in turn is also based on the original ideas of unit testing that come from Smalltalk, so it's object-oriented in nature. For this reason, tests are written through objects, where the checks are verified by methods, and it's common to group tests by scenarios in classes.

To start writing unit tests, we have to create a test class that inherits from unittest.TestCase, and define the conditions we want to stress on its methods. ...