Test-Driven Development Principles in Practice
Test-Driven Development Principles in Practice Test-driven development (TDD) is more than writing tests before code. It is a disciplined approach that guides what we build, how we build it, and how we keep software healthy over time. By naming expectations first, teams create a safety net that catches problems early and clarifies design goals. At the heart of TDD lies the red-green-refactor loop. You start by writing a failing test that describes the desired behavior. Then you add the simplest code that makes the test pass. Finally, you clean up the design without changing how it behaves. When done well, this cycle stays brief and fast, keeping ideas focused and understandable. Teams often connect TDD with continuous integration, so each change runs the full test suite and signals when something breaks. ...