coverage-report.yml

name: Test Coverage Report

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  coverage:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          components: llvm-tools-preview

      - name: Cache cargo
        uses: Swatinem/rust-cache@v2

      - name: Install cargo-llvm-cov
        run: cargo install cargo-llvm-cov

      - name: Generate coverage report
        run: |
          cargo llvm-cov --workspace --lib --bins --tests --all-features --lcov --output-path lcov.info
          cargo llvm-cov --workspace --lib --bins --tests --all-features --html

      - name: Coverage threshold check
        run: |
          COVERAGE=$(cargo llvm-cov --workspace --lib --bins --tests --all-features --json | jq -r '.data[0].totals.percent_covered')
          echo "📊 Current Coverage: ${COVERAGE}%"
          
          # Set minimum coverage threshold
          THRESHOLD=80
          
          if (( $(echo "$COVERAGE >= $THRESHOLD" | bc -l) )); then
            echo "✅ Coverage threshold met: ${COVERAGE}% >= ${THRESHOLD}%"
            echo "coverage=${COVERAGE}" >> $GITHUB_OUTPUT
          else
            echo "❌ Coverage threshold NOT met: ${COVERAGE}% < ${THRESHOLD}%"
            echo "coverage=${COVERAGE}" >> $GITHUB_OUTPUT
            exit 1
          fi
        id: coverage

      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v3
        with:
          file: lcov.info
          flags: unittests
          name: codecov-umbrella
          fail_ci_if_error: false

      - name: Upload coverage artifacts
        uses: actions/upload-artifact@v3
        with:
          name: coverage-report-${{ github.sha }}
          path: target/llvm-cov/html/
          retention-days: 30

      - name: Coverage comment
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v6
        with:
          script: |
            const coverage = '${{ steps.coverage.outputs.coverage }}';
            const threshold = 80;
            
            const comment = `## 📊 Test Coverage Report
            
            **Current Coverage:** ${coverage}%
            **Required Threshold:** ${threshold}%
            **Status:** ${coverage >= threshold ? '✅ PASS' : '❌ FAIL'}
            
            ${coverage >= threshold ? 
              'Great job! The test coverage meets the minimum requirements.' : 
              'Test coverage is below the minimum threshold. Please add more tests to improve coverage.'}
            
            ---
            *This comment was automatically generated by the coverage check workflow.*`;
            
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: comment
            });