Why TDD? Test-Driven Development flips the usual workflow on its head: instead of writing code and then testing it, you write a failing test first, then write just enough code to make it pass, then clean up. The result is a growing suite of tests that document exactly what the code must do — and a codebase that is only as complex as the tests demand. We will build a classic toy app — a Magic 8-Ball (Github)— from scratch using this discipline. The Red → Green → Refactor Cycle Every increment of TDD follows three phases: Phase Goal 🔴…