Correction socket

client/src/__tests__/components/StudentWaitPage/StudentWaitPage.test.tsx

@@ -17,6 +17,7 @@ describe('StudentWaitPage Component', () => {
         launchQuiz: jest.fn(),
         roomName: 'Test Room',
         setQuizMode: jest.fn(),
+        setIsRoomSelectionVisible: jest.fn()
     };
 
     test('renders StudentWaitPage with correct content', () => {
@@ -39,5 +40,4 @@ describe('StudentWaitPage Component', () => {
 
         expect(screen.getByRole('dialog')).toBeInTheDocument();
     });
-
+});
-})

client/src/pages/Teacher/ManageRoom/ManageRoom.tsx

@@ -201,6 +201,16 @@ const ManageRoom: React.FC = () => {
                     webSocketService.launchStudentModeQuiz(roomName, quizQuestions);
                 }
             });
+
+            socket.on('join-failure', (message) => {
+                setConnectingError(message);
+                setSocket(null);
+            });
+
+            socket.on('user-disconnected', (userId: string) => {
+                console.log(`Student left: id = ${userId}`);
+                setStudents((prevUsers) => prevUsers.filter((user) => user.id !== userId));
+            });
         };
     
         if (rooms.length === 0) {