We’ve all been there. You have a new feature to build. You open your IDE, create a Controller, start wiring up the logic, maybe add some validation, and then, hours later, you finally write a test to make sure it actually works. Or, if we’re being honest, maybe you don’t write the test at all.
This is the “code first, ask questions later” approach. And while it feels fast at the start, it’s exactly how we end up with legacy code that nobody dares to touch. It’s how “it works on my machine” turns into a 3:00 AM emergency production fix.
Test-Driven Development (TDD) flips this on its head. Instead of writing code to solve a problem and then writing tests to verify it, you write the test first. It sounds counterintuitive, but it’s a game-changer for maintainability. Let’s break it down into the cycle that actually defines professional software development: Red, Green, Refactor.
Previous article in this category: https://codecraftdiary.com/2026/06/01/flaky-tests-in-laravel/
The Cycle Explained: It’s a Rhythm, Not a Rule
