name: Test

on: [push, pull_request]

jobs:
  build:
    # We want to run on external PRs, but not on our own internal PRs as they'll be run
    # by the push to the branch. Without this if check, checks are duplicated since
    # internal PRs match both the push and pull_request events.
    if:
      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
      github.repository

    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        python-version: [3.6, 3.7, 3.8, 3.9]
        os: [ubuntu-latest, macOS-latest, windows-latest]

    steps:
      - uses: actions/checkout@v2

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v2
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          python -m pip install --upgrade tox

      - name: Unit tests
        run: |
          tox -e py -- -v --color=yes

      - name: Publish coverage to Coveralls
        # If pushed / is a pull request against main repo AND
        # we're running on Linux (this action only supports Linux)
        if:
          ((github.event_name == 'push' && github.repository == 'psf/black') ||
          github.event.pull_request.base.repo.full_name == 'psf/black') && matrix.os ==
          'ubuntu-latest'

        uses: AndreMiras/coveralls-python-action@v20201129
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          parallel: true
          flag-name: py${{ matrix.python-version }}-${{ matrix.os }}
          debug: true

  coveralls-finish:
    needs: build
    # If pushed / is a pull request against main repo
    if:
      (github.event_name == 'push' && github.repository == 'psf/black') ||
      github.event.pull_request.base.repo.full_name == 'psf/black'

    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Coveralls finished
        uses: AndreMiras/coveralls-python-action@v20201129
        with:
          parallel-finished: true
          debug: true