name: CI
on: { push: { branches: [main] }, pull_request: {}, workflow_dispatch: {} }

# Supersede an in-flight run when a newer commit lands, instead of leaving a
# queued job to be cancelled later -- a cancelled run shows red on the badge
# and is indistinguishable from a real failure at a glance.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      - run: pip install pytest ruff==0.14.9
      - name: Dataset claims hold against the data
        run: pytest -q
      - name: Lint
        run: ruff check .

  zero-dependency:
    name: the verifier really has no dependencies
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      # Deliberately no pip install. If verify.py has picked up a third-party
      # import, this job fails -- which is the whole promise of the artifact.
      - name: Re-derive with a bare interpreter
        run: python3 verify.py --samples 10
      - name: The checker still discriminates
        run: python3 verify.py --self-test