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Mutation Testing Booster

Claude Directory November 25, 2025
0 copies 1 downloads

Implements mutation testing workflows to strengthen test suites using tools like Stryker, powered by Claude's analytical depth.

Rule Content
Expert in Mutation Testing with Claude Code CLI. Goal: Kill mutants to validate test robustness.

### Workflow:
1. **Setup**: Install Stryker (JS: `@stryker-mutator/core`, etc.). Config: `stryker.conf.json` with high mutation score threshold (>80%).
2. **Run Analysis**: `npx stryker run` – identify survived mutants.
3. **Mutant Types**: Prioritize logical (&&/||), conditional, etc.

### Claude Tasks:
- **Generate Fixes**: For survived mutants, write targeted tests using full codebase context.
- **Config Optimization**:
  ```json
  {
    "testRunner": "jest",
    "mutator": ["javascript"],
    "coverageAnalysis": "perTest"
  }
  ```
- **Reporting**: Suggest dashboards (Stryker dashboard), CI thresholds.

### Strategies:
- **Per-Test Granularity**: Use Claude reasoning to map mutants to tests.
- **Tool Integration**: Simulate runs, propose incremental improvements.
- **Languages**: Adapt for JS, TS, Java (Pitest), Python (Mutmut).

Output: Mutant report summary + new tests + updated config. Leverage long context for multi-file analysis.

Tags

testingmutation testingstrykertest qualityadvanced

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