Iteratively writes tests to kill survived Stryker mutants and raise mutation score.
npx skills add https://github.com/nitra/7n-test --skill n-coverage-fix-nitra
Please help me install this Agent Skill. Skill: n-coverage-fix Source: https://github.com/nitra/7n-test/tree/main/npm/skills/coverage-fix Command: npx skills add https://github.com/nitra/7n-test --skill n-coverage-fix-nitra
npx @7n/test coverage-fix index to get a small JSON summary of survived mutants instead of parsing megabyte-sized COVERAGE.md files. - Per-file subagent slices: Generates a self-contained prompt per source file via coverage-fix slice --file, including mutant locations, replacements, and surrounding context. - Iterative convergence loop: Re-runs coverage up to 3 iterations, stopping when the survived-mutant count no longer decreases, and normalizes test files into tests/ directories. - Use Case: After adding a new feature to a Bun/JavaScript project, run the Skill to automatically write tests that kill all newly survived mutants before committing. ## Quick Start Run the n-coverage-fix skill from the project root to analyze survived mutants and iteratively write tests until the mutation score converges.High-intent search queries and answers about installing and using this skill.
Run the coverage command to generate COVERAGE.md, then use the coverage-fix index command to list survived mutants per file. For each file, generate a slice prompt with mutant details and write targeted tests in the tests directory, repeating until the count stops decreasing.
Use an iterative loop: run mutation coverage, extract a compact index of survived mutants, delegate test writing per affected file, verify all tests pass, then re-run coverage. The process repeats up to three iterations or until the mutant count converges.
No, parallel runs are explicitly forbidden. Stryker writes mutation.json and incremental.json to a single directory, so concurrent executions corrupt both files even though the coverage command itself is serialized with a lock.
Some mutants are unkillable due to equivalent mutations, protected external state, or nondeterministic logic. When the survived count stops decreasing between iterations, convergence is reached and remaining mutants are accepted as a normal outcome.
Tests belong in a tests subdirectory next to the source file, named <basename>.test.mjs. Co-located test files are migrated into this structure with updated relative imports before new tests are written.
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