feat(f3): add reveal scoreboard and next-round transition

lobby/tests.py

@@ -546,3 +546,74 @@ class ScoreCalculationTests(TestCase):
         self.assertEqual(first.status_code, 200)
         self.assertEqual(second.status_code, 409)
         self.assertEqual(second.json()["error"], "Scores already calculated for this round question")
+
+
+class RevealRoundFlowTests(TestCase):
+    def setUp(self):
+        self.host = User.objects.create_user(username="host_reveal", password="secret123")
+        self.other_user = User.objects.create_user(username="other_reveal", password="secret123")
+        self.session = GameSession.objects.create(host=self.host, code="RVL123", status=GameSession.Status.REVEAL)
+        self.player_one = Player.objects.create(session=self.session, nickname="Luna", score=9)
+        self.player_two = Player.objects.create(session=self.session, nickname="Mads", score=3)
+
+    def test_host_can_get_reveal_scoreboard(self):
+        self.client.login(username="host_reveal", password="secret123")
+
+        response = self.client.get(
+            reverse(
+                "lobby:reveal_scoreboard",
+                kwargs={"code": self.session.code},
+            )
+        )
+
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.REVEAL)
+        self.assertEqual([item["nickname"] for item in payload["leaderboard"]], ["Luna", "Mads"])
+
+    def test_reveal_scoreboard_requires_host(self):
+        self.client.login(username="other_reveal", password="secret123")
+
+        response = self.client.get(
+            reverse(
+                "lobby:reveal_scoreboard",
+                kwargs={"code": self.session.code},
+            )
+        )
+
+        self.assertEqual(response.status_code, 403)
+        self.assertEqual(response.json()["error"], "Only host can view scoreboard")
+
+    def test_host_can_start_next_round_from_reveal(self):
+        self.client.login(username="host_reveal", password="secret123")
+
+        response = self.client.post(
+            reverse(
+                "lobby:start_next_round",
+                kwargs={"code": self.session.code},
+            )
+        )
+
+        self.assertEqual(response.status_code, 200)
+        payload = response.json()
+        self.assertEqual(payload["session"]["status"], GameSession.Status.LOBBY)
+        self.assertEqual(payload["session"]["current_round"], 2)
+
+        self.session.refresh_from_db()
+        self.assertEqual(self.session.status, GameSession.Status.LOBBY)
+        self.assertEqual(self.session.current_round, 2)
+
+    def test_start_next_round_rejects_wrong_phase(self):
+        self.client.login(username="host_reveal", password="secret123")
+        self.session.status = GameSession.Status.GUESS
+        self.session.save(update_fields=["status"])
+
+        response = self.client.post(
+            reverse(
+                "lobby:start_next_round",
+                kwargs={"code": self.session.code},
+            )
+        )
+
+        self.assertEqual(response.status_code, 400)
+        self.assertEqual(response.json()["error"], "Next round can only start from reveal phase")