Insert sleep

e2e/contents/navigate.test.js

@@ -25,6 +25,8 @@ describe("navigate test", () => {
       return keys.press(targetTab.id, 'g');
     }).then(() => {
       return keys.press(targetTab.id, 'u');
+    }).then(() => {
+      return new Promise(resolve => { setTimeout(() => resolve(), 10) });
     }).then(() => {
       return tabs.get(targetTab.id);
     }).then((tab) => {