coverage.yaml

name: Code Coverage

on:
  workflow_call:
    inputs:
      web-prover-circuits-cache-key:
        required: true
        type: string
    outputs:
      coverage-report:
        description: "Path to the coverage report"
        value: ${{ jobs.coverage.outputs.coverage-report }}

jobs:
  coverage:
    name: Generate code coverage
    runs-on: ubuntu-latest
    permissions:
      contents: read
      checks: write
      pull-requests: write  # Needed for coverage comments
    outputs:
      coverage-report: ${{ steps.upload-coverage.outputs.artifact-url }}
    
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2  # Needed for coverage comparison in PRs

      - uses: ./.github/actions/setup-rust-ubuntu
        with:
          rust-cache-key: coverage

      - name: Install tarpaulin
        run: cargo install cargo-tarpaulin --version "^0.27"  # Pin version for stability

      - name: Run tarpaulin
        id: run-tarpaulin
        run: |
          cargo tarpaulin --workspace \
            --exclude client_wasm \
            --timeout 360 \
            --out Xml \
            --out Html \
            --output-dir coverage \
            --exclude-files 'tests/*' \
            --fail-under 70  # Fail if coverage drops below 70%

      - name: Upload coverage reports to Codecov
        uses: codecov/codecov-action@v3
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          files: ./coverage/cobertura.xml
          fail_ci_if_error: true  # Fail if upload fails
          verbose: true  # Better debugging

      - name: Upload coverage report
        id: upload-coverage
        uses: actions/upload-artifact@v4
        with:
          name: coverage-report
          path: coverage/
          retention-days: 7
          if-no-files-found: error  # Fail if no coverage files generated

      - name: Check coverage report exists
        run: |
          if [ ! -f coverage/tarpaulin-report.html ]; then
            echo "Coverage report not generated"
            exit 1
          fi