TDD Basics

Summary

Test-Driven Development — writing a failing test before writing the implementation, then writing just enough code to make it pass, then refactoring.

• 1Practice the red-green-refactor cycle on one small function.
• 2Notice how writing the test first changes how you design the function's interface.
• 3Try TDD on a real feature and reflect on whether it helped or slowed you down for that case.