Root cause
JUnit 5 skill pack for creating, debugging, modernizing, documenting, and routing JVM test workflows.
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Use when Codex needs to analyze a failing JUnit 5 test run, identify the most likely root cause, and produce a developer-focused diagnosis with concrete next fixes.
SKILL.md
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JUnit 5 Root Cause Analysis
1. Capture the Failure
- Capture the failing class, method, stack trace, and environment details.
- Reproduce the failure as narrowly as possible.
- Separate symptom from suspected cause.
2. Classify the Failure
- Check for assertion mismatch.
- Check for fixture leakage or ordering issues.
- Check for environment mismatch.
- Check for timing, randomness, file system, locale, or time zone issues.
- Check for a real production bug.
3. Report the Diagnosis
- State the most likely root cause.
- State the evidence supporting that conclusion.
- State the smallest safe next fix.
- State any remaining uncertainty explicitly.