Backend runtime upgraded.

Signed-off-by: Cliff Hill <xlorep@darkhelm.org>

backend/tests/integration/test_api.py

@@ -23,3 +23,34 @@ class TestAPIIntegration:
         response = client.get("/")
         assert response.status_code == 200
         assert response.json() == {"message": "Plex Playlist Backend API"}
+
+    def test_startup_rejects_invalid_runtime_policy(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """Startup should fail fast when compatibility policy is invalid."""
+        monkeypatch.setenv("BACKEND_REQUIRED_PYTHON", "99.0")
+
+        with pytest.raises(RuntimeError), TestClient(app):
+            pass
+
+        monkeypatch.delenv("BACKEND_REQUIRED_PYTHON", raising=False)
+
+    def test_compatibility_endpoint_reports_policy_status(
+        self, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
+        """Compatibility endpoint should expose runtime and pinning policy status."""
+        monkeypatch.setenv("BACKEND_REQUIRED_PYTHON", "3.14")
+
+        with TestClient(app) as local_client:
+            response = local_client.get("/compatibility")
+
+        assert response.status_code == 200
+        payload = response.json()
+        assert payload["ok"] is True
+        assert payload["required_python"] == "3.14"
+        assert "current_python" in payload
+        assert "required_packages" in payload
+        assert payload["required_packages"]["fastapi"] == "0.120.2"
+        assert payload["required_packages"]["uvicorn"] == "0.38.0"
+
+        monkeypatch.delenv("BACKEND_REQUIRED_PYTHON", raising=False)