Create Code Coverage Aggregation System

[adriandarian]

Create centralized system for aggregating and tracking code coverage across all repositories.

Details

Organization-wide code coverage tracking with trends, goals, and quality gates.

System Components

• Coverage collection from all repos
• Central coverage database
• Aggregation and analysis
• Trend tracking
• Quality gate enforcement
• Coverage reports

Coverage Collection

Supported Tools

• JavaScript/TypeScript: Istanbul/NYC, Jest
• Python: Coverage.py, pytest-cov
• Go: go test -cover
• Rust: cargo-tarpaulin, llvm-cov
• Java: JaCoCo
• C#: coverlet

Integration Points

• Codecov (primary)
• Coveralls (alternative)
• SonarQube
• Custom collection

Metrics Tracked

Line Coverage

• Lines covered
• Lines total
• Percentage

Branch Coverage

• Branches covered
• Branches total
• Percentage

Function Coverage

• Functions covered
• Functions total
• Percentage

Additional Metrics

• Test-to-code ratio
• Changed lines coverage
• Uncovered critical paths
• Coverage trends

Quality Gates

Define org-wide standards:

coverage_requirements:
  overall:
    min: 70%
    target: 80%
    goal: 90%
  
  new_code:
    min: 80%
    target: 90%
  
  critical_files:
    min: 90%
    paths:
      - src/core/
      - src/security/
  
  pr_requirements:
    diff_coverage: 80%
    decrease_allowed: 1%

Workflow Integration

• Collect coverage on every test run
• Upload to central system
• Compare to base branch
• Comment on PRs with coverage change
• Block merge if below threshold
• Generate coverage badges

PR Comments

## Coverage Report

Overall: 82.5% (+1.2%) ✅
Diff: 85.0% ✅

### Changes
- `src/feature.ts`: 95.0% → 96.5% (+1.5%)
- `src/utils.ts`: 88.0% → 85.0% (-3.0%) ⚠️

### Uncovered Lines
- src/utils.ts: lines 45-52
- src/feature.ts: line 103

[View detailed report](https://codecov.io/...)

Organization Dashboard

Overview

• Org-wide coverage percentage
• Repositories by coverage tier
• Coverage trends (7d, 30d, 90d)
• Worst covered repositories
• Best practices adoption

Per-Repository

• Coverage history
• File-level coverage
• Uncovered code hotspots
• Coverage by directory
• Test distribution

Insights

• Coverage improvement opportunities
• Repositories needing attention
• Coverage quality distribution
• Testing efficiency metrics

Reports

Weekly Report

• Coverage changes
• Repositories improved/declined
• New repositories added
• Quality gate violations
• Recommendations

Monthly Report

• Coverage trends
• Goal progress
• Quality metrics
• Team performance
• Action items

Badge Generation

Auto-generate badges for:

• Overall coverage
• Branch coverage
• Trend indicator
• Quality gate status

Acceptance Criteria

• Coverage collection from all repos
• Central aggregation working
• Quality gates enforced
• PR comments accurate
• Dashboard comprehensive
• Reports generated automatically
• Badges updated correctly
• Trend analysis functional
• Documentation complete
• Tested with 10+ repos