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Use PIT (Pitest) mutation testing to identify weak tests and improve test quality in Java projects. Finds tests that pass but don't actually verify behavior correctly. Use when improving test suite quality beyond line coverage metrics.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
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SOC 職業分類に基づく
| name | mutation-testing |
| description | Use PIT (Pitest) mutation testing to identify weak tests and improve test quality in Java projects. Finds tests that pass but don't actually verify behavior correctly. Use when improving test suite quality beyond line coverage metrics. |
| compatibility | Java projects using Gradle 8.x+ with JUnit 5 or Spock |
| metadata | {"version":"2.0.0","technology":"java","category":"testing","tags":["java","gradle","testing","mutation-testing","pitest","quality"]} |
Use PIT mutation testing to identify tests that pass but don't verify behavior correctly.
📚 references/ - Detailed documentation
bash java/scripts/check-pitest-readiness.sh
Copy java/templates/pitest.gradle to gradle/pitest.gradle and apply in build.gradle.
# QUICK level - fast feedback
./gradlew pitest -Ppitest.mutators=DEFAULTS
# STANDARD level - recommended
./gradlew pitest -Ppitest.mutators=STRONGER
# COMPREHENSIVE level - thorough
./gradlew pitest -Ppitest.mutators=ALL
open build/reports/pitest/index.html
Focus on SURVIVED mutants - these indicate weak tests.
Add specific assertions that kill the surviving mutants.
High line coverage with low mutation score = tests run code but don't verify results.
| Level | Mutators | Use Case | Time |
|---|---|---|---|
| QUICK | DEFAULTS (~11) | Initial analysis, CI | 1x |
| STANDARD | STRONGER (~14) | Regular improvement | 1.5x |
| COMPREHENSIVE | ALL (~30+) | Critical logic | 3-5x |
| Status | Meaning | Action |
|---|---|---|
| Killed | Test detected mutation | Good |
| Survived | Test missed mutation | Improve test |
| No Coverage | No test covers code | Write test |
| Timed Out | Infinite loop | Usually OK |
| Reference | Description |
|---|---|
| references/intensity-levels.md | Detailed mutator descriptions |
| references/improving-tests.md | Patterns for killing mutants |
| references/configuration.md | PIT configuration options |
| references/troubleshooting.md | Common issues and solutions |
| Skill | Purpose |
|---|---|
| java-testing | Test configuration |
| java-coverage | JaCoCo coverage |