diff --git a/gatewayservice/gateway-service.js b/gatewayservice/gateway-service.js
index 8a428834..73402ba5 100644
--- a/gatewayservice/gateway-service.js
+++ b/gatewayservice/gateway-service.js
@@ -188,10 +188,6 @@ app.post('/addgame', async (req, res) => {
 app.get('/getParticipation/:userId', async (req, res) => {
   try {
     const userId = req.params.userId;
-    if (!userId) {
-      res.status(404).json({ error: 'User ID not provided' });
-      return;
-    }
     const apiUrl = `${gameServiceUrl}/getParticipation/${userId}`;
     try{
       const gameResponse = await axios.get(apiUrl);
diff --git a/gatewayservice/gateway-service.test.js b/gatewayservice/gateway-service.test.js
index 61adf000..056d90bd 100644
--- a/gatewayservice/gateway-service.test.js
+++ b/gatewayservice/gateway-service.test.js
@@ -26,6 +26,17 @@ describe('Gateway Service', () => {
         }
       });
     }
+    else if (url.endsWith('/addgame')) {
+      return Promise.resolve({
+        data: {
+          user: userId,
+          pAcertadas: 5,
+          pFalladas: 3,
+          totalTime: 1200,
+          gameMode: 'normal'
+        }
+      });
+    }
   });
   axios.get.mockImplementation((url) => {
     if (url.endsWith('/api/questions/create')) {
@@ -69,6 +80,23 @@ describe('Gateway Service', () => {
       return Promise.resolve({ data: { username: 'testuser' } });
     }
   });
+
+
+  it('should return 401 Unauthorized if authorization token is missing', async () => {
+    const response = await request(app).post('/addgame');
+    expect(response.statusCode).toBe(401);
+    expect(response.body).toEqual({ error: 'Unauthorized' });
+  });
+
+  it('should return 401 Unauthorized if authorization token is invalid', async () => {
+    const mockedToken = 'invalidToken';
+    axios.get.mockRejectedValueOnce({ response: { status: 401 } });
+    const response = await request(app)
+      .post('/addgame')
+      .set('Authorization', `Bearer ${mockedToken}`);
+    expect(response.statusCode).toBe(401);
+    expect(response.body).toEqual({ error: 'Unauthorized' });
+  });
    // Test /health endpoint
    it('should give information of the status', async () => {
     const response = await request(app)
@@ -89,13 +117,24 @@ describe('Gateway Service', () => {
   });
   // Test /verify endpoint
   it('should verify authorization token with auth service', async () => {
+    const mockedToken = 'mockedToken';
+    const authResponse = { username: 'testuser' };
+    axios.get.mockResolvedValueOnce({ data: authResponse });
     const response = await request(app)
       .get('/verify')
-      .set('Authorization', 'Bearer mockedToken');
+      .set('Authorization', `Bearer ${mockedToken}`);
     expect(response.statusCode).toBe(200);
-    expect(response.body).toHaveProperty('username', 'testuser');
+    expect(response.body).toEqual(authResponse);
+  });
+  it("should return 401 Unauthorized for unauthorized request", async () => {
+    const response = await request(app).get("/verify");
+    expect(response.statusCode).toBe(401);
+    expect(response.body).toEqual({ error: "Unauthorized" });
   });
 
+
+
+
   // Test /adduser endpoint
   it('should forward add user request to user service', async () => {
     const response = await request(app)
diff --git a/webapp/src/test/AddUser.test.js b/webapp/src/test/AddUser.test.js
index 9df46e59..d0c0f062 100644
--- a/webapp/src/test/AddUser.test.js
+++ b/webapp/src/test/AddUser.test.js
@@ -135,4 +135,40 @@ describe('AddUser component', () => {
     fireEvent.click(button5);
 
   });
+  it('should handle successful user registration and login', async () => {
+    render(
+      <SessionContext.Provider value={{ saveSessionData: () => {},clearSessionData: jest.fn() }}> 
+        <AddUser goTo={(parameter) => {}}/>
+      </SessionContext.Provider>
+    );
+
+    const usernameInput = screen.getByLabelText(/Username/i);
+    const passwordInput = screen.getByLabelText('Password');
+    const confirmPasswordInput = screen.getByLabelText(/Confirm/i);
+    const addUserButton = screen.getByRole('button', { name: /SIGN UP/i });
+
+    // Simulate user input
+    fireEvent.change(usernameInput, { target: { value: 'testUser' } });
+    fireEvent.change(passwordInput, { target: { value: 'testPassword' } });
+    fireEvent.change(confirmPasswordInput, { target: { value: 'testPassword' } });
+
+    // Mock the axios.post request to simulate a successful response
+    mockAxios.onPost('http://localhost:8000/adduser').reply(200);
+    mockAxios.onPost(`http://localhost:8000/login`).reply(200, {
+      createdAt: '2022-01-01',
+      username: 'testUser',
+      token: 'testToken',
+      profileImage: 'testProfileImage',
+      userId: 'testUserId',
+    });
+
+    // Trigger the add user button click
+    fireEvent.click(addUserButton);
+
+    // Wait for the Snackbar to be open
+    await waitFor(() => {
+      expect(screen.queryByText(/Passwords do not match/i)).toBeNull();
+    });
+  });
+
 });
diff --git a/webapp/src/test/PostGame.test.js b/webapp/src/test/PostGame.test.js
index b6c65f3f..71381ed0 100644
--- a/webapp/src/test/PostGame.test.js
+++ b/webapp/src/test/PostGame.test.js
@@ -87,4 +87,36 @@ describe('PostGame component', () => {
     // Check if the snackbar is displayed
     expect(await screen.findByText('Game saved successfully')).toBeInTheDocument();
   });
+  test('closes the snackbar correctly', () => {
+    // Mock the SessionContext value
+    const sessionData = {
+      userId: 'mockedUserId',
+      token: 'mockedToken'
+    };
+
+    // Mock the setOpenSnackbar function
+    const setOpenSnackbar = jest.fn();
+    const handleCloseSnackbar = jest.fn();
+    render(
+      <SessionContext.Provider value={{ sessionData }}>
+      <PostGame setOpenSnackbar={setOpenSnackbar} handleCloseSnackbar={handleCloseSnackbar} />
+      </SessionContext.Provider>
+    );
+
+    // Set the initial state of the snackbar to open
+    act(() => {
+      setOpenSnackbar(false);
+    });
+
+    // Call the handleCloseSnackbar function
+    act(() => {
+      handleCloseSnackbar();
+    });
+
+    // Check if setOpenSnackbar is false
+    expect(setOpenSnackbar).toHaveBeenCalledWith(false);
+
+    // Check if the snackbar is closed
+    expect(screen.queryByText('Game saved successfully')).not.toBeInTheDocument();
+  });
 });
\ No newline at end of file