Support empty dedicated room listings

tests/test_http_api.py

@@ -92,6 +92,21 @@ class DiscoveryHTTPTests(unittest.TestCase):
         assert body is not None
         self.assertEqual(body["error"]["code"], "invalid_room")
 
+    def test_empty_dedicated_room_can_be_listed(self) -> None:
+        status, created = self.request(
+            "POST", "/v1/rooms", dict(VALID_ROOM, current_players=0)
+        )
+        self.assertEqual(status, 201)
+        assert created is not None
+        room = created["room"]
+        assert isinstance(room, dict)
+        self.assertEqual(room["current_players"], 0)
+        self.request(
+            "DELETE",
+            f"/v1/rooms/{room['room_id']}",
+            token=str(created["lease_token"]),
+        )
+
     def test_health_endpoint(self) -> None:
         status, body = self.request("GET", "/health")
         self.assertEqual(status, 200)

tests/test_registry.py

@@ -49,6 +49,12 @@ class RoomRegistryTests(unittest.TestCase):
         self.registry.delete(room.room_id, token)
         self.assertEqual(self.registry.list_rooms(), [])
 
+    def test_empty_dedicated_room_is_valid(self) -> None:
+        room, _token = self.registry.create(
+            "203.0.113.10", dict(VALID_ROOM, current_players=0)
+        )
+        self.assertEqual(room.current_players, 0)
+
     def test_expired_room_is_removed(self) -> None:
         room, token = self.registry.create("203.0.113.10", VALID_ROOM)
         self.clock.now += 30.0