[#451] added websocket connexion (#453)

* [#451] added websocket connexion

* [#451] added tests

* [#451] add missing cleanup for web socket causing memory leaks

__test__/features/websocket/utils/setupWebsocket.ts

@@ -0,0 +1,35 @@
+export function setupWebsocket() {
+  const originalWebSocket = global.WebSocket;
+  const webSocketInstances: any[] = [];
+  const mockWebSocket = jest.fn().mockImplementation((url: string) => {
+    const ws = {
+      url,
+      readyState: WebSocket.CONNECTING,
+      addEventListener: jest.fn(),
+      removeEventListener: jest.fn(),
+      send: jest.fn(),
+      close: jest.fn(),
+      _listeners: {} as Record<string, Function[]>,
+    };
+
+    ws.addEventListener.mockImplementation((event, handler) => {
+      ws._listeners[event] ??= [];
+      ws._listeners[event].push(handler);
+    });
+
+    ws.removeEventListener.mockImplementation((event, handler) => {
+      ws._listeners[event] =
+        ws._listeners[event]?.filter((h) => h !== handler) ?? [];
+    });
+
+    webSocketInstances.push(ws);
+    return ws;
+  });
+
+  global.WebSocket = mockWebSocket as any;
+  const cleanup = () => {
+    global.WebSocket = originalWebSocket;
+    webSocketInstances.length = 0;
+  };
+  return { webSocketInstances, mockWebSocket, cleanup };
+}