code-coverage.yaml

name: Code Coverage
on: [pull_request]
  
jobs:
  report-base:
    name: Generate base report
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Base
        uses: actions/checkout@v3
        with:
          ref: master

      - name: Set up Go
        uses: actions/setup-go@v3
        with:
          go-version: '^1.20.2'

      - name: Generate report
        run: |
          go test -coverprofile cover-base.out ./cmd/... ./pkg/...

      - name: Upload report
        uses: actions/upload-artifact@v3
        with:
          name: cover-base
          path: cover-base.out

  report-pr:
    name: Generate PR report
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR
        uses: actions/checkout@v3

      - name: Set up Go
        uses: actions/setup-go@v3
        with:
          go-version: '^1.20.2'

      - name: Generate reports
        run: |
          go test -coverprofile cover-pr.out ./cmd/... ./pkg/...

      - name: Upload report
        uses: actions/upload-artifact@v3
        with:
          name: cover-pr
          path: cover-pr.out

  code-coverage:
    name: Output code coverage
    runs-on: ubuntu-latest
    needs: [report-base, report-pr]
    steps:
      - name: Download reports
        uses: actions/download-artifact@v3

      - name: Set up Go
        uses: actions/setup-go@v3
        with:
          go-version: '^1.20.2'

      - name: Install copherage Tool
        run: go install k8s.io/test-infra/robots/coverage@latest

      - name: Generate Comment
        id: generate-comment
        run: |
          echo 'comment<<EOF' >> $GITHUB_OUTPUT
          echo '<!-- pr-coverage -->' >> $GITHUB_OUTPUT
          echo '## Code Coverage Diff' >> $GITHUB_OUTPUT
          coverage diff cover-base/cover-base.out cover-pr/cover-pr.out | sed -e '1,5d' >> $GITHUB_OUTPUT
          echo 'EOF' >> $GITHUB_OUTPUT

      - name: Create or Update Comment
        uses: edumserrano/find-create-or-update-comment@v1
        with:
          issue-number: ${{ github.event.pull_request.number }}
          body-includes: '<!-- pr-coverage -->'
          comment-author: 'github-actions[bot]'
          body: ${{ steps.generate-comment.outputs.comment }}
          edit-mode: replace