How do you test the argument parsing bit of an application that uses argparse? This episode covers: Design for Test: Structuring your app or script so it's easier to test. pytest & capsys for testing stdout Adding debug and preview flags for debugging and testing And reverting to subprocess.run if you can't modify the code under test Also, there's a full writeup and code samples available: Blog post: Testing argparse Applications  Code Repo The Complete pytest Course For the fastest way to learn pytest, go to courses.pythontest.com Whether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.