A github action that add test coverage annotations to your files using an istanbul-style coverage JSON file (jest compatible).

Requires the following permission:

• checks: write

- name: Coverage annotations
  uses: jgillick/test-coverage-annotations@v1
  with:
    access-token: ${{ secrets.GITHUB_TOKEN }}
    coverage: ./coverage/coverage-final.json
    only-changed-files: true

• access-token: Your github access token. Needed to add annotations.
• coverage: Path to the test coverage JSON file.
• coverage-working-directory: The path of the directory that the coverage was generated in. Defaults to pwd of the run. (see below for more details)
• only-changed-files: Only annotate changed files in the PR.

Assuming you use jest, here's how you can use this action:

jobs:
  test:
    runs-on: ubuntu-latest
    permissions:
      checks: write
    steps:
      # First generate coverage
      - name: Get coverage
        run: yarn jest --coverage

      # Generate annotations
      - name: Coverage annotations
        uses: jgillick/test-coverage-annotations@v1
        with:
          access-token: ${{ secrets.GITHUB_TOKEN }}
          coverage: coverage/coverage-final.json
          only-changed-files: true

This is important. The coverage JSON file will contain the full path to each file in the report. This includes a path before your repository. For example: /home/app/my_repo/file/test.ts. In order to apply annotations to files correctly, we only need the path starting at the repo directory and need to strip the prefix /home/app/my_repo/.

By default, this action will use the current working directory of the run.