Unit Testing for Beginners: Write Your First Tests in Python and JavaScript (unittest, pytest, node:test)
Here is a situation every student developer knows. Your POS system worked yesterday. Today you changed one line in the discount code, and now the change computation is wrong, but you only find out during the capstone defense when a panelist buys a ₱99.95 item with a ₱100 bill. Unit tests exist to catch that kind of mistake in seconds, long before anyone else sees it. Many beginners skip testing