TheophilusChinomona Test Coverage Skill
Purpose
Measure, report, and enforce test coverage thresholds.
Activation
- User says "check coverage" or "what's the coverage?"
- Before creating a PR
- When coverage drops below threshold
How It Works
1. Detect Test Framework
JavaScript/TypeScript:
jest.config.* → npx jest --coverage
vitest.config.* → npx vitest --coverage
.nycrc → npx nyc report
Python:
pytest.ini → pytest --cov
pyproject.toml [tool.pytest] → pytest --cov
.NET:
*.Tests.csproj → dotnet test /p:CollectCoverage=true
2. Run Coverage
# JavaScript/TypeScript
npx jest --coverage --coverageReporters=text-summary
# Python
pytest --cov=src --cov-report=term-missing
# .NET
dotnet test /p:CollectCoverage=true /p:CoverletOutputFormat=lcov
3. Report
Coverage Report
═══════════════
Lines: 85% (120/141)
Branches: 78% (45/58)
Functions: 92% (33/36)
Below 80% threshold:
src/auth.ts: 65% (missing edge cases)
src/utils.ts: 72% (missing error paths)
Threshold
- Minimum: 80% line coverage
- Target: 90% line coverage
- Branches: 75% minimum
Anti-Patterns
- Do NOT skip coverage on "simple" files
- Do NOT mock everything — integration tests need real calls
- Do NOT ignore coverage drops — investigate and fix