diff --git a/addons/bus/static/tests/helpers/mock_websocket.js b/addons/bus/static/tests/helpers/mock_websocket.js
index 25965683d26..32b5fa5256d 100644
--- a/addons/bus/static/tests/helpers/mock_websocket.js
+++ b/addons/bus/static/tests/helpers/mock_websocket.js
@@ -55,6 +55,14 @@ class SharedWorkerMock extends EventTarget {
     }
 }
 
+class WorkerMock extends SharedWorkerMock {
+    constructor(websocketWorker) {
+        super(websocketWorker);
+        this.port.start();
+        this.postMessage = this.port.postMessage.bind(this.port);
+    }
+}
+
 let websocketWorker;
 /**
  * @param {*} params Parameters used to patch the websocket worker.
@@ -81,6 +89,14 @@ export function patchWebsocketWorkerWithCleanup(params = {}) {
             });
             return sharedWorker;
         },
+        Worker: function () {
+            const worker = new WorkerMock(websocketWorker);
+            registerCleanup(() => {
+                worker._messageChannel.port1.close();
+                worker._messageChannel.port2.close();
+            });
+            return worker;
+        },
     });
     registerCleanup(() => {
         if (websocketWorker) {