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Measure test strength with code mutations v1.0.0

Use this resource to check that tests really catch bugs using code mutations

New

  • 485 downloads
  • 116 likes
  • 166 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install mutation-testing-test-strength

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent mutates the code (changed operators, removed statements), runs the tests against each mutant, computes the mutation score and lists the surviving mutants. It then strengthens the affected tests with Stryker.

Mostly picked by

Updated November 2, 2026

Card for the “Measure test strength with code mutations” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md: score interpretation, common operators and fixing surviving mutants
  • references/mutation-operators.md: list of mutation operators

Good fit for

  • High coverage does not show the tests check anything
  • You want to find the weak tests of a critical module

Not for

    Tags

    • mutation
    • tests
    • stryker
    • quality

    About

    You say

    “Run a mutation analysis on the pricing module and list the surviving mutants.”

    Card for the “Measure test strength with code mutations” skill

    Skill published by proffesor-for-testing under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to check that tests really catch bugs using code mutations
    3. Review and adjust the result

    Content preview

    Files

    • config.json0.5 KB
    • evals/mutation-testing.yaml18.4 KB
    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • references/mutation-operators.md1.5 KB
    • run-history.json0.4 KB
    • schemas/output.json20.8 KB
    • scripts/validate-config.json0.7 KB
    • SKILL.md7.1 KB
    • test-data/sample-output.json8.9 KB

    Origin and licence

    Listed unmodified

    Author
    proffesor-for-testing
    Source
    github.com/proffesor-for-testing/agentic-qe/tree/b177b2315521376b83f2eed40e4994fd7581d067/assets/skills/mutation-testing
    Licence
    MIT

    Notice

    « mutation-testing » (proffesor-for-testing, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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