name: gatelock tests

on:
  push:
    branches: [main]
    # The workflow's own file counts as gatelock: editing only this file used
    # to trigger nothing, so a fix to the job itself could never prove itself.
    paths: ['gatelock/**', '.github/workflows/gatelock-tests.yml']
  pull_request:
    branches: [main]
    paths: ['gatelock/**', '.github/workflows/gatelock-tests.yml']

jobs:
  test:
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: gatelock
    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.x"

      - name: Install dependencies
        run: pip install -r requirements.txt

      # The viewport, fit-check and keyboard tests drive real Tk: focus
      # delivery, canvas scrolling and widget heights are Tk's own behaviour,
      # and mocking them is what let a viewport that scrolled itself pass
      # every check for a week. Headless they skip, silently taking coverage
      # with them -- so the runner gets a display instead.
      - name: Install a virtual X display
        run: sudo apt-get update && sudo apt-get install -y xvfb

      - name: Run tests with coverage
        run: xvfb-run -a -s "-screen 0 1600x1200x24" python -m pytest -v