report_test_coverage.yml

name: Report Test Coverage

on:
  workflow_run:
    workflows: [Build on PR]
    types:
      - completed

jobs:
  report-test-coverage:
    runs-on: ubuntu-latest
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    steps:
      - name: "Download artifact"
        uses: actions/github-script@v6
        with:
          script: |
            let allArtifacts = await github.rest.actions.listWorkflowRunArtifacts({
               owner: context.repo.owner,
               repo: context.repo.repo,
               run_id: context.payload.workflow_run.id,
            });
            let matchArtifact = allArtifacts.data.artifacts.filter((artifact) => {
              return artifact.name == "report"
            })[0];
            let download = await github.rest.actions.downloadArtifact({
               owner: context.repo.owner,
               repo: context.repo.repo,
               artifact_id: matchArtifact.id,
               archive_format: 'zip',
            });
            let fs = require('fs');
            fs.writeFileSync(`${process.env.GITHUB_WORKSPACE}/report.zip`, Buffer.from(download.data));

      - name: "Unzip artifact"
        id: unzip
        run: |
          unzip report.zip
          if [ -f "coverage.txt" ]; then
            echo "hasReport=true" >> $GITHUB_OUTPUT
          else
            echo "hasReport=false" >> $GITHUB_OUTPUT
          fi

      - name: Make Coverage Report Collapsable
        if: steps.unzip.outputs.hasReport == 'true'
        run: |
          covNum=$(cat cov_number)
          title="The code coverage for the changed files is ${covNum}%."
          touch coverage_report.txt
          echo $title >> coverage_report.txt
          echo " " >> coverage_report.txt
          echo "<details>" >> coverage_report.txt
          echo "<summary>Click me to view the complete report</summary>" >> coverage_report.txt
          echo " " >> coverage_report.txt
          echo "\`\`\`" >> coverage_report.txt
          cat coverage.txt >> coverage_report.txt
          echo "\`\`\`" >> coverage_report.txt
          echo "</details>" >> coverage_report.txt
          mv coverage_report.txt coverage.txt

      - name: "Comment on PR"
        if: steps.unzip.outputs.hasReport == 'true'
        uses: actions/github-script@v6
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            let fs = require('fs');
            let issue_number = Number(fs.readFileSync('./pr_number'));
            let owner = context.repo.owner;
            let repo = context.repo.repo;
            let run_id = context.payload.workflow_run.id;
            let run_url = `https://github.com/${owner}/${repo}/actions/runs/${run_id}`
            let body = fs.readFileSync('./coverage.txt', {encoding:'utf8', flag:'r'})

            await github.rest.issues.createComment({
              owner: owner,
              repo: repo,
              issue_number: issue_number,
              body: body
            });