coverage.yml

name: Coverage

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

permissions:
  contents: read

jobs:
  contract-coverage:
    name: Contract coverage (≥ 95%)
    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 Rust build artifacts
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target/
          key: ${{ runner.os }}-cargo-cov-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: ${{ runner.os }}-cargo-cov-

      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov

      - name: Run coverage
        run: |
          cargo llvm-cov \
            --workspace \
            --features testutils \
            --lcov \
            --output-path lcov.info

      - name: Enforce 95% line coverage threshold
        run: |
          cargo llvm-cov \
            --workspace \
            --features testutils \
            --summary-only 2>&1 | tee coverage-summary.txt

          LINE_COV=$(grep -oP 'Lines\s+\K[\d.]+(?=%)' coverage-summary.txt | head -1)
          echo "Line coverage: ${LINE_COV}%"

          # Use awk for float comparison (bash can't do floats)
          PASS=$(awk -v cov="$LINE_COV" 'BEGIN { print (cov >= 95.0) ? "yes" : "no" }')
          if [ "$PASS" != "yes" ]; then
            echo "::error::Coverage ${LINE_COV}% is below the required 95% threshold."
            exit 1
          fi
          echo "Coverage check passed: ${LINE_COV}%"

      - name: Upload coverage report
        uses: actions/upload-artifact@v4
        with:
          name: lcov-${{ github.sha }}
          path: lcov.info
          retention-days: 30