Running Mutation Tests
This skill empowers Claude to execute mutation testing, providing insights into the effectiveness of a test suite. By introducing small changes (mutations) into the code and running the tests, it determines if the tests are capable of detecting these changes. This helps identify weaknesses in the test suite and improve overall code quality.
Install
/plugin marketplace add jeremylongshore/claude-code-plugins-plus-skills
/plugin install mutation-test-runner@claude-code-plugins-plusRun these inside Claude Code. The skill comes with its plugin.
What this skill does
This skill enables Claude to validate test suite quality by performing mutation testing. It is triggered when the user asks to run mutation tests, analyze test effectiveness, or improve test coverage. The skill introduces code mutations, runs tests against the mutated code, and reports on the "survival rate" of the mutations, indicating the effectiveness of the test suite. Use this skill when the user requests to assess the quality of their tests using mutation testing techniques. Specific trigger terms include "mutation testing", "test effectiveness", "mutation score", and "surviving mutants"
Trigger phrases
Claude loads this skill automatically when you say things like:
How it works
- Test Execution: The test suite is run against the mutated code.
- Result Analysis: The plugin analyzes which mutations were "killed" (detected by tests) and which "survived" (were not detected).
- Reporting: A mutation score is calculated, and surviving mutants are identified for further investigation.
When to use it
- Validate the effectiveness of a test suite.
- Identify gaps in test coverage.
- Improve the mutation score of a project.
- Analyze surviving mutants to strengthen tests.
Best practices
- Analyze Survivors: Prioritize the analysis of surviving mutants to identify the most impactful improvements to test coverage.
- Iterative Improvement: Use mutation testing as part of an iterative process to continuously improve test suite quality.
Details
- Skill name
running-mutation-tests- Plugin
- mutation-test-runner
FAQ
What does the Running Mutation Tests skill do?
This skill enables Claude to validate test suite quality by performing mutation testing. It is triggered when the user asks to run mutation tests, analyze test effectiveness, or improve test coverage. The skill introduces code mutations, runs tests against the mutated code, and reports on the "survival rate" of the mutations, indicating the effectiveness of the test suite. Use this skill when the user requests to assess the quality of their tests using mutation testing techniques. Specific trigger terms include "mutation testing", "test effectiveness", "mutation score", and "surviving mutants"
How do I install the Running Mutation Tests skill?
Claude Code plugin: /plugin marketplace add jeremylongshore/claude-code-plugins-plus-skills then /plugin install mutation-test-runner@claude-code-plugins-plus. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.
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