Test Coverage

Analyze and improve test coverage with detailed reporting and gap analysis: $ARGUMENTS

Current Coverage Context

• Test framework: !find . -name "jest.config.*" -o -name ".nycrc*" -o -name "coverage.xml" | head -1 || echo "Detect framework"
• Coverage tools: !npm ls nyc jest @jest/core 2>/dev/null | grep -E "nyc|jest" | head -2 || echo "No JS coverage tools"
• Existing coverage: !find . -name "coverage" -type d | head -1 && echo "Coverage data exists" || echo "No coverage data"
• Test files: !find . -name "*.test.*" -o -name "*.spec.*" | wc -l test files

Task

Execute comprehensive coverage analysis with improvement recommendations and reporting:

Coverage Type: Use $ARGUMENTS to focus on line coverage, branch coverage, function coverage, statement coverage, or comprehensive reporting

Coverage Analysis Framework:

1. Coverage Tool Setup - Configure appropriate tools (Jest, NYC, Istanbul, Coverage.py, JaCoCo), setup collection settings, optimize performance, enable reporting
2. Coverage Measurement - Generate line coverage, branch coverage, function coverage, statement coverage reports, identify uncovered code paths
3. Gap Analysis - Identify critical uncovered paths, analyze coverage quality, assess business logic coverage, evaluate edge case handling
4. Threshold Management - Configure coverage thresholds, implement quality gates, setup trend monitoring, enforce minimum standards
5. Reporting & Visualization - Generate detailed reports, create coverage dashboards, implement trend analysis, setup automated notifications
6. Improvement Planning - Prioritize coverage gaps, recommend test additions, identify refactoring opportunities, plan coverage enhancement

Advanced Features: Differential coverage analysis, coverage trend monitoring, integration with code review, automated coverage alerts, performance impact assessment.

Quality Insights: Coverage quality assessment, test effectiveness analysis, maintainability correlation, risk area identification.

Output: Comprehensive coverage analysis with detailed reports, gap identification, improvement recommendations, and quality metrics tracking.