F3: persist mixed answer order for stable UI reconnect

lobby/tests.py

@@ -308,7 +308,9 @@ class MixAnswersTests(TestCase):
         self.assertEqual(payload["session"]["status"], GameSession.Status.GUESS)
 
         self.session.refresh_from_db()
+        self.round_question.refresh_from_db()
         self.assertEqual(self.session.status, GameSession.Status.GUESS)
+        self.assertEqual(self.round_question.mixed_answers, answer_texts)
 
     def test_mix_answers_requires_host(self):
         self.client.login(username="other", password="secret123")
@@ -339,6 +341,30 @@ class MixAnswersTests(TestCase):
         answer_texts = [entry["text"] for entry in response.json()["answers"]]
         self.assertEqual(set(answer_texts), {"København", "Aarhus"})
 
+    def test_mix_answers_is_idempotent_after_transition_to_guess(self):
+        LieAnswer.objects.create(round_question=self.round_question, player=self.player_one, text="Aarhus")
+        LieAnswer.objects.create(round_question=self.round_question, player=self.player_two, text="Odense")
+
+        self.client.login(username="host", password="secret123")
+        first = self.client.post(reverse("lobby:mix_answers", kwargs={"code": self.session.code, "round_question_id": self.round_question.id}))
+        second = self.client.post(reverse("lobby:mix_answers", kwargs={"code": self.session.code, "round_question_id": self.round_question.id}))
+
+        self.assertEqual(first.status_code, 200)
+        self.assertEqual(second.status_code, 200)
+        self.assertEqual([entry["text"] for entry in first.json()["answers"]], [entry["text"] for entry in second.json()["answers"]])
+
+    def test_session_detail_returns_persisted_mixed_answers_for_reconnect(self):
+        LieAnswer.objects.create(round_question=self.round_question, player=self.player_one, text="Aarhus")
+        LieAnswer.objects.create(round_question=self.round_question, player=self.player_two, text="Odense")
+
+        self.client.login(username="host", password="secret123")
+        mix_response = self.client.post(reverse("lobby:mix_answers", kwargs={"code": self.session.code, "round_question_id": self.round_question.id}))
+        detail_response = self.client.get(reverse("lobby:session_detail", kwargs={"code": self.session.code}))
+
+        self.assertEqual(mix_response.status_code, 200)
+        self.assertEqual(detail_response.status_code, 200)
+        self.assertEqual([entry["text"] for entry in mix_response.json()["answers"]], [entry["text"] for entry in detail_response.json()["round_question"]["answers"]])
+
 
 class GuessSubmissionTests(TestCase):
     def setUp(self):