Test Discipline Agent Skill
Update tests when changing APIs — no exceptions
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/microsoft/Generative-AI-for-beginners-dotnet --skill test-disciplineThe instruction itself
4 sections, as written by the authorContext
When APIs or public interfaces change, tests must be updated in the same commit. When test assertions reference file counts or expected arrays, they must be kept in sync with disk reality. Stale tests block CI for other contributors.
Patterns
- API changes → test updates (same commit): If you change a function signature, public interface, or exported API, update the corresponding tests before committing
- Test assertions → disk reality: When test files contain expected counts (e.g.,
EXPECTED_FEATURES,EXPECTED_SCENARIOS), they must match the actual files on disk - Add files → update assertions: When adding docs pages, features, or any counted resource, update the test assertion array in the same commit
- CI failures → check assertions first: Before debugging complex failures, verify test assertion arrays match filesystem state
Examples
✓ Correct:
- Changed auth API signature → updated auth.test.ts in same commit
- Added
distributed-mesh.mdto features/ → added'distributed-mesh'to EXPECTED_FEATURES array - Deleted two scenario files → removed entries from EXPECTED_SCENARIOS
✗ Incorrect:
- Changed spawn parameters → committed without updating casting.test.ts (CI breaks for next person)
- Added
built-in-roles.md→ left EXPECTED_FEATURES at old count (PR blocked) - Test says "expected 7 files" but disk has 25 (assertion staleness)
Anti-Patterns
- Committing API changes without test updates ("I'll fix tests later")
- Treating test assertion arrays as static (they evolve with content)
- Assuming CI passing means coverage is correct (stale assertions can pass while being wrong)
- Leaving gaps for other agents to discover
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How to use it
Take microsoft/generative-ai-for-beginners-dotnet-test-discipline from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.