Choose meaningful tests, run them, interpret failures, and prevent regressions.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Testing skill
1. Inspect the existing test runner and conventions before adding dependencies.
2. Add tests for the user's expected behavior and at least one relevant edge case.
3. Prefer deterministic tests with temporary directories and mocked external boundaries.
4. Do not mark a test passed based only on static inspection. Run it and record the actual exit status.
5. If a test needs network access, credentials, a real device, or a service that is unavailable, state that limitation clearly.
6. Avoid tests that mutate a developer's real home directory or run an unreviewed installer.
The line at the top of this page pins the label git:20261027.afafa89, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_e5ab6iid344ze4ls
GET https://markdownregistry.com/api/v1/resolve?ref=fahthiz/oasis/testing
GET https://markdownregistry.com/api/v1/blob/f5908dc837d93984bd64272c2c886079f9bb0b9e8704723fd710f588dfc6782b
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