diff --git a/src/browser/existing-browser.js b/src/browser/existing-browser.js
index 9293d738d..7a0536c09 100644
--- a/src/browser/existing-browser.js
+++ b/src/browser/existing-browser.js
@@ -12,9 +12,9 @@ const Camera = require("./camera");
 const clientBridge = require("./client-bridge");
 const history = require("./history");
 const logger = require("../utils/logger");
-const dns = require('node:dns');
+const dns = require("node:dns");
 
-dns.setDefaultResultOrder('ipv4first'); //https://github.com/webdriverio/webdriverio/issues/8279 
+dns.setDefaultResultOrder("ipv4first"); //https://github.com/webdriverio/webdriverio/issues/8279
 
 const OPTIONAL_SESSION_OPTS = ["transformRequest", "transformResponse"];
 
@@ -88,7 +88,7 @@ module.exports = class ExistingBrowser extends Browser {
 
         for (let handle of currentOpenWindows) {
             try {
-                await  this._session.switchToWindow(handle)
+                await this._session.switchToWindow(handle);
                 await this._session.closeWindow();
             } catch (e) {
                 if (!e.message.includes("no such window")) {
@@ -96,14 +96,14 @@ module.exports = class ExistingBrowser extends Browser {
                 }
             }
         }
-        
+
         if (this._browserContext) {
             this._browserContext.close();
         }
         this._browserContext = context;
-        
+
         const [newWindow] = await this._session.getWindowHandles();
-        await  this._session.switchToWindow(newWindow)
+        await this._session.switchToWindow(newWindow);
     }
 
     markAsBroken() {
diff --git a/test/src/browser/utils.js b/test/src/browser/utils.js
index de59022c7..ea350b3d4 100644
--- a/test/src/browser/utils.js
+++ b/test/src/browser/utils.js
@@ -81,7 +81,12 @@ exports.mkSessionStub_ = () => {
     session.waitUntil = sinon.stub().named("waitUntil").resolves();
     session.setTimeout = sinon.stub().named("setTimeout").resolves();
     session.setTimeouts = sinon.stub().named("setTimeouts").resolves();
-    session.getPuppeteer = sinon.stub().named("getPuppeteer").resolves({});
+    session.getPuppeteer = sinon
+        .stub()
+        .named("getPuppeteer")
+        .resolves({ createIncognitoBrowserContext: () => ({ newPage: () => {}, close: () => {} }) });
+    session.getWindowHandles = sinon.stub().named("getWindowHandles").resolves([]);
+    session.switchToWindow = sinon.stub().named("switchToWindow").resolves();
     session.$ = sinon.stub().named("$").resolves(element);
 
     session.addCommand = sinon.stub().callsFake((name, command, isElement) => {