Playbooks
Practical guides and workflows for developers.
Fixtures and golden files: save the input, save the output, diff
Capture real inputs as fixtures, approve golden outputs, and let the diff catch what hand-typed assertions miss.
9 min read
Ghost tests: find out if your test suite is lying
Find the tests that would never fail: a prompt-driven mutation pass, the real tooling, and how to kill the survivors.
5 min read
The review checklist for AI-written codebases
Eight checks I run on an AI-written codebase before real users touch it, with copy-paste prompts to run each one.
7 min read
The testing playbook for AI-written code
The RED → GREEN loop, six test types that earn their keep, and copy-paste prompts to find what to test first.
9 min read