🏗️(y-provider) organize yjs server

Many routes were in the server.ts file, now they
are in their own files in the handlers folder.
The server.ts file is now AppServer that handles
the routes.
We split as well the tests.

src/frontend/servers/y-provider/__tests__/collaborationResetConnections.test.ts

@@ -0,0 +1,76 @@
+import request from 'supertest';
+
+const port = 5555;
+const origin = 'http://localhost:3000';
+
+jest.mock('../src/env', () => {
+  return {
+    PORT: port,
+    COLLABORATION_SERVER_ORIGIN: origin,
+    COLLABORATION_SERVER_SECRET: 'test-secret-api-key',
+  };
+});
+
+console.error = jest.fn();
+
+import { hocusPocusServer } from '@/servers/hocusPocusServer';
+
+import { initServer } from '../src/servers/appServer';
+
+const { app, server } = initServer();
+
+describe('Server Tests', () => {
+  afterAll(() => {
+    server.close();
+  });
+
+  test('POST /collaboration/api/reset-connections?room=[ROOM_ID] invalid origin', async () => {
+    const response = await request(app as any)
+      .post('/collaboration/api/reset-connections/?room=test-room')
+      .set('Origin', 'http://invalid-origin.com')
+      .send({ document_id: 'test-document' });
+
+    expect(response.status).toBe(403);
+    expect(response.body.error).toBe('CORS policy violation: Invalid Origin');
+  });
+
+  test('POST /collaboration/api/reset-connections?room=[ROOM_ID] with incorrect API key should return 403', async () => {
+    const response = await request(app as any)
+      .post('/collaboration/api/reset-connections/?room=test-room')
+      .set('Origin', origin)
+      .set('Authorization', 'wrong-api-key');
+
+    expect(response.status).toBe(403);
+    expect(response.body.error).toBe('Forbidden: Invalid API Key');
+  });
+
+  test('POST /collaboration/api/reset-connections?room=[ROOM_ID] failed if room not indicated', async () => {
+    const response = await request(app as any)
+      .post('/collaboration/api/reset-connections/')
+      .set('Origin', origin)
+      .set('Authorization', 'test-secret-api-key')
+      .send({ document_id: 'test-document' });
+
+    expect(response.status).toBe(400);
+    expect(response.body.error).toBe('Room name not provided');
+  });
+
+  test('POST /collaboration/api/reset-connections?room=[ROOM_ID] with correct API key should reset connections', async () => {
+    // eslint-disable-next-line jest/unbound-method
+    const { closeConnections } = hocusPocusServer;
+    const mockHandleConnection = jest.fn();
+    (hocusPocusServer.closeConnections as jest.Mock) = mockHandleConnection;
+
+    const response = await request(app as any)
+      .post('/collaboration/api/reset-connections?room=test-room')
+      .set('Origin', origin)
+      .set('Authorization', 'test-secret-api-key');
+
+    expect(response.status).toBe(200);
+    expect(response.body.message).toBe('Connections reset');
+
+    expect(mockHandleConnection).toHaveBeenCalled();
+    mockHandleConnection.mockClear();
+    hocusPocusServer.closeConnections = closeConnections;
+  });
+});