tests.yml

name: Run Tests

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

# Cancel superseded in-progress runs for the same branch / PR.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5
      - uses: actions/setup-python@v5
        with:
          python-version-file: .python-version
      # runs every hook in .pre-commit-config.yaml (ruff, black, mypy, ...)
      - uses: pre-commit/action@v3.0.1

  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5

      # Installs uv, provisions Python from .python-version, and caches ~/.cache/uv.
      - uses: astral-sh/setup-uv@v5
        with:
          enable-cache: true

      - name: Sync environment
        run: uv sync --frozen

      - name: Run tests
        run: uv run pytest --verbose --cov=src tests/

  # Verify the production image builds. Layer caching reuses the expensive
  # `uv sync` layer, which only rebuilds when pyproject.toml / uv.lock change.
  docker:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v5
      - uses: docker/setup-buildx-action@v3
      - name: Build image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: false
          cache-from: type=gha
          # Only write the cache from main, so PRs reuse main's layers without
          # each branch repopulating the (size-limited) Actions cache.
          cache-to: ${{ github.ref == 'refs/heads/main' && 'type=gha,mode=max' || '' }}