Self-Testing Code for Efficient Refactoring

It is optional to test every controller, model, and view. A practical approach is to spend 20% of your time test-first and 80% test-after. It’s essential to understand what’s worth testing beyond common examples.

Design changes are inevitable with every alteration to a system. Regardless of experience level, every programmer is a designer. Design decisions are made with every line of code written. The objective is to make changes that lead to a more straightforward design and prevent future regrets. TDD applies evolutionary pressure on design, allowing for cost-effective and flexible system extensions. Self-testing code and TDD make running tests easy and maintain code healthily. Self-testing code allows the system to test itself efficiently, making refactoring and software delivery quicker.