legacy-testing
Skill31 starsChanged 50 days agoNo licenceView on GitHub
Michael Feathers–style legacy code change — treat code without automated tests as legacy, then follow identify change points, find test points, break dependencies, add tests (often characterization), and only then modify or refactor. Covers seams (object/link/preprocessing), sensing vs separation, fakes/mocks, sprout/wrap, pinch points, effect sketches, and dependency-breaking patterns. Composes with bugfix, TDD, and refactoring once a harness exists. Roadmap id: add-tests-to-legacy-code. Use when changing untested code, introducing a test seam, or adding coverage before a risky edit.
1 other project uses a version of this.
Adopted by
Most recently taken up by
- dmoka/skillstheir own version, first seen Oct 5, 2026
Other versions1 project uses a version of this.
Word for word · 0
None found.
Edited · 0
None found.
Wrote their own version · 1
- dmoka/skills★ 1same name
How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.
In this repository13 other files it gives its agents.
- AGENTS.mdAGENTS.md
- atddSkill
- bugfixSkill
- increment-reviewSkill
- montecarlo-epicSkill
- montecarlo-epicsSkill
- montecarlo-single-itemSkill
- new-featureSkill
- new-incrementSkill
- refactoringSkill
- spikeSkill
- tddSkill
- tweakSkill
The file
We split this skill into the rules it gives an agent
5 rules. About 0 are common, 4 are distinctive, and 1 is very specific to this project.
≈0
Common · estimate
Many files like this have a rule of this kind.
≈4
Distinctive · estimate
This author's own choices. Worth a look.
1
Very specific
Tied to their project's names, files or tools. Probably skip.
No licence file, so all rights are reserved — read it at the source. We count its rules but don't quote them. Read them on GitHub.
≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.
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