Test-Driven Development in the Age of AI: A Practical Guide for Software Engineers to Write Code That Works When Machines Write It Too
English | September 25, 2026 | ASIN: B0HKZXN2GC | 211 pages | Epub | 2.49 MB
Your AI assistant writes code faster than you can read it. How do you know it works?Claude Code, Cursor, and Copilot have changed the job. The bottleneck is no longer typing. It's trust. Every day you merge code you didn't write line by line, and every day you hope the edge cases are covered.Test-Driven Development in the Age of AI gives you a better answer than hope. It teaches the classic TDD discipline (red, green, refactor) on a realistic codebase. Then it shows why TDD becomes your most powerful tool once a machine writes the implementation: your tests become the spec you give the agent and the proof you check.Inside, you'll learn how to:Write tests that specify behavior, not implementation, so refactors stop breaking your suiteUse mocks, stubs, and fakes without ending up in mock hellChoose the right test level for every change: unit, integration, or end-to-endDrive features from the outside in with acceptance tests that describe what users needTame legacy code with characterization tests and seamsTurn failing tests into prompts so AI agents build exactly what you specifiedCatch AI failure modes: edited tests, hardcoded answers, over-mocking, and invented APIsAdd property-based and mutation testing as safety nets for machine-written codeNo toy katas. No dogma. Every chapter builds Parcelo, a real order-and-checkout service, in TypeScript with Vitest, with Python and pytest equivalents throughout. You'll get checklists, copy-paste prompt templates, the full companion code on GitHub, and a 30-day plan to make TDD a habit on your team.This book is for you if:You're a working engineer who ships with AI assistants and wants to merge with confidenceYou tried TDD once, found it slow, and dropped itYour test suite is brittle, slow, and breaks every time you refactorYou want a repeatable workflow that gets you closer to senior and staff-level judgmentIf you've tried TDD before and dropped it, this book shows you what changed. If you've never tried it, there's never been a better time.Get your copy and write your next feature test-first.
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