Normalize session code input in join and lookup flows

lobby/tests.py

@@ -60,6 +60,28 @@ class LobbyFlowTests(TestCase):
         self.assertTrue(body["player"]["session_token"])
         self.assertTrue(Player.objects.filter(session=session, nickname="Luna").exists())
 
+    def test_player_can_join_with_trimmed_code(self):
+        session = GameSession.objects.create(host=self.host, code="ABCD23")
+
+        response = self.client.post(
+            reverse("lobby:join_session"),
+            data={"code": "  abcd23  ", "nickname": "Luna"},
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 201)
+        self.assertTrue(Player.objects.filter(session=session, nickname="Luna").exists())
+
+    def test_join_rejects_code_empty_after_trim(self):
+        response = self.client.post(
+            reverse("lobby:join_session"),
+            data={"code": "   ", "nickname": "Luna"},
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error"], "Session code is required")
+
     def test_join_rejects_duplicate_nickname_case_insensitive(self):
         session = GameSession.objects.create(host=self.host, code="QWER12")
         Player.objects.create(session=session, nickname="Luna")
@@ -131,6 +153,21 @@ class StartRoundTests(TestCase):
         round_config = RoundConfig.objects.get(session=self.session, number=1)
         self.assertEqual(round_config.category, self.category)
 
+    def test_host_start_round_uses_normalized_session_code_from_path(self):
+        self.client.login(username="host", password="secret123")
+
+        response = self.client.post(
+            reverse("lobby:start_round", kwargs={"code": "  abcd23  "}),
+            data={"category_slug": self.category.slug},
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 201)
+        self.session.refresh_from_db()
+        self.assertEqual(self.session.status, GameSession.Status.LIE)
+        round_config = RoundConfig.objects.get(session=self.session, number=1)
+        self.assertEqual(round_config.category, self.category)
+
     def test_start_round_requires_host(self):
         self.client.login(username="other", password="secret123")