Add staging gameplay smoke artifact output

lobby/tests.py

@@ -1,4 +1,7 @@
+import json
+import tempfile
 from datetime import timedelta
+from pathlib import Path
 
 from django.contrib.auth import get_user_model
 from django.core.management import call_command
@@ -972,3 +975,31 @@ class SmokeStagingCommandTests(TestCase):
         session = GameSession.objects.latest("created_at")
         self.assertEqual(session.status, GameSession.Status.FINISHED)
         self.assertEqual(Player.objects.filter(session=session).count(), 3)
+
+    def test_smoke_staging_writes_artifact_when_requested(self):
+        with tempfile.TemporaryDirectory() as tmp_dir:
+            artifact_path = Path(tmp_dir) / "smoke.json"
+            call_command("smoke_staging", artifact=str(artifact_path))
+
+            self.assertTrue(artifact_path.exists())
+            payload = json.loads(artifact_path.read_text(encoding="utf-8"))
+            self.assertTrue(payload["ok"])
+            self.assertEqual(payload["command"], "smoke_staging")
+            self.assertEqual(payload["players"], ["P1", "P2", "P3"])
+            self.assertIn("generated_at", payload)
+            self.assertIn("session_code", payload)
+            self.assertEqual(
+                payload["steps"],
+                [
+                    "create_session",
+                    "join_players",
+                    "start_round",
+                    "show_question",
+                    "submit_lies",
+                    "mix_answers",
+                    "submit_guesses",
+                    "calculate_scores",
+                    "reveal_scoreboard",
+                    "finish_game",
+                ],
+            )