ci: ensure test fixtures are generated

.github/workflows/tests-ensure-fixtures.yml

@@ -0,0 +1,60 @@
+name: Test Fixture Consistency
+
+on:
+  pull_request:
+    branches:
+      - '**'
+
+concurrency:
+  group: tests-fixture-${{ github.head_ref || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  changes:
+    name: Detect changed files
+    runs-on: ubuntu-latest
+    outputs:
+      pypi: ${{ steps.changes.outputs.pypi }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dorny/paths-filter@v3
+        id: changes
+        with:
+          filters: |
+            pypi:
+              - 'tests/repositories/fixtures/pypi.org/**'
+
+  ensure-pypi:
+    name: PyPI
+    runs-on: ubuntu-latest
+    needs: changes
+    if: needs.changes.outputs.pypi == 'true'
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Bootstrap poetry
+        run: pipx install poetry
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: poetry
+
+      - name: Configure poetry
+        run: |
+          poetry config virtualenvs.in-project true
+          poetry config virtualenvs.options.no-pip true
+          poetry config virtualenvs.options.no-setuptools true
+
+      - name: Install dependencies
+        run: poetry install --only main,test
+
+      - name: Regenerate PyPI fixtures
+        run: PYTHONPATH="$PWD" poetry run python tests/repositories/fixtures/pypi.org/generate.py
+
+      - name: Check for changed files
+        run: git diff --exit-code --stat HEAD tests/repositories/fixtures/pypi.org