[demo] Failing check to try the dev_status mod diagnosis (do not merge)

.github/workflows/diagnose-demo.yml

@@ -0,0 +1,18 @@
+# Throwaway: gives a PR one failing check, to try the dev_status mod's
+# "Diagnose failure" against a real GitHub Actions log. Never merge.
+name: Diagnose demo
+
+on:
+  pull_request:
+
+jobs:
+  tests:
+    name: Diagnose demo tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - run: pip install pytest
+      - run: pytest tests/diagnose_demo -q

tests/diagnose_demo/test_version_bump.py

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+"""Throwaway test that fails on purpose (see .github/workflows/diagnose-demo.yml)."""
+
+
+def bump_minor(version: str) -> str:
+    major, minor, _patch = version.split(".")
+    return f"{major}.{minor}.0"  # bug on purpose: the minor is never incremented
+
+
+def test_bump_minor_resets_patch():
+    assert bump_minor("0.10.3") == "0.11.0"