# Test Driven Hook Debugging

> Debugging and fixing shell hooks by writing isolated test suites first, then using test failures to pinpoint logic bugs

- Skill: `vamseeachanta/test-driven-hook-debugging` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/test-driven-hook-debugging`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/test-driven-hook-debugging/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/test-driven-hook-debugging

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# Test-Driven Hook Debugging

When a shell hook has subtle logic bugs (e.g., git operations failing silently in non-repo contexts), write a focused test suite in Python using `subprocess` to call the hook in controlled scenarios. Run tests to see the failure mode, then trace the gap between test expectations and hook behavior. Use guard clauses (e.g., `git rev-parse --git-dir` before `git log`) to handle edge cases. Re-run tests atomically after each fix to confirm the change. This approach isolates the bug and prevents regressions better than manual testing.