This guide will teach you how to write unit tests for Python functions. But why should you consider writing unit tests at all? Well, when working on a large project, you'll often have to update certain modules and refactor code as needed. But such changes can have unintended consequences on

freeCodeCamp is a nonprofit organization offering free online coding courses and programming tutorials, covering topics such as web development, data science, and machine learning. Learners can gain practical coding skills, build real-world projects, and earn certifications to advance their careers in tech.

freeCodeCamp

This guide will help you get started with unit testing in Python. You'll learn how to use Python's built-in unittest module to set up and run unit tests and write test cases to test Python functions. We'll start by defining a Python function and write unit tests to check if it works as expected. There are four test methods, each checking for a specific input. For arguments of other types, you can use type hinting to enforce types and raise exceptions as needed.

How to Write Unit Tests for Python Functions

How to Define Test Cases for Python Functions

How to Write Unit Tests to Check for Exceptions

How to Use the assertRaises() Method to Test Exceptions