MD Bookmarks: Prevent navigating to invalid folders

chrome/test/data/webui/md_bookmarks/router_test.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 suite('<bookmarks-router>', function() {
   var store;
   var router;
 
   function navigateTo(route) {
     window.history.replaceState({}, '', route);
@@ skipping 57 matching lines @@
   /**
    * Reset the page state with a <bookmarks-app> and a clean Store, with the
    * given |url| to trigger routing initialization code.
    */
   function setupWithUrl(url) {
     PolymerTest.clearBody();
     bookmarks.Store.instance_ = undefined;
     window.history.replaceState({}, '', url);
 
     chrome.bookmarks.getTree = function(callback) {
-      console.log('getTree');
-      console.log(window.location.href);
       callback([
         createFolder(
             '0',
             [
               createFolder(
                   '1',
                   [
                     createFolder('11', []),
                   ]),
               createFolder(
@@ skipping 19 matching lines @@
     setupWithUrl('/?q=testQuery');
     assertEquals('testQuery', lastQuery);
   });
 
   test('loading a folder URL selects that folder', function() {
     setupWithUrl('/?id=2');
     var state = bookmarks.Store.getInstance().data;
     assertEquals('2', state.selectedFolder);
     assertDeepEquals(['21'], bookmarks.util.getDisplayedList(state));
   });
+
+  test('loading an invalid folder URL selects the Bookmarks Bar', function() {
+    setupWithUrl('/?id=42');
+    var state = bookmarks.Store.getInstance().data;
+    assertEquals('1', state.selectedFolder);
+    return Promise.resolve().then(function() {
+      assertEquals('chrome://bookmarks/?id=1', window.location.href);
+    });
+  });
 });