mutation-testing.yml

name: Mutation Testing

on:
  workflow_dispatch:
  schedule:
    # Run quarterly: first day of Jan, Apr, Jul, Oct at 02:00 UTC
    - cron: '0 2 1 1,4,7,10 *'
  push:
    paths:
      - 'aura-vault/src/lib.rs'
      - 'aura-vault/src/storage.rs'
      - 'aura-vault/src/fee.rs'
      - 'aura-vault/src/errors.rs'

jobs:
  mutation-testing:
    name: cargo-mutants
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: aura-vault
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust stable
        uses: dtolnay/rust-toolchain@stable
        with:
          targets: wasm32-unknown-unknown

      - name: Cache Rust artifacts
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            aura-vault/target
          key: ${{ runner.os }}-cargo-mutants-${{ hashFiles('aura-vault/Cargo.lock') }}

      - name: Install cargo-mutants
        run: cargo install cargo-mutants --locked

      - name: Run mutation testing
        run: cargo mutants --output mutants.out --timeout 120 2>&1 | tee mutation-report.txt
        continue-on-error: true

      - name: Check mutation score
        run: |
          if [ -f mutants.out/mutants.out ]; then
            CAUGHT=$(grep -c 'caught' mutants.out/mutants.out || echo 0)
            MISSED=$(grep -c 'missed' mutants.out/mutants.out || echo 0)
            TOTAL=$((CAUGHT + MISSED))
            if [ $TOTAL -gt 0 ]; then
              SCORE=$(echo "scale=1; $CAUGHT * 100 / $TOTAL" | bc)
              echo "Mutation score: $SCORE% ($CAUGHT/$TOTAL)"
              if (( $(echo "$SCORE < 80" | bc -l) )); then
                echo "::error::Mutation score $SCORE% is below 80% threshold"
                exit 1
              fi
            fi
          fi

      - name: Upload mutation report
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: mutation-report
          path: |
            aura-vault/mutation-report.txt
            aura-vault/mutants.out/
          retention-days: 30