[Local NTP] Add a simple test for embeddedSearch.newTabPage.mostVisited

chrome/test/data/local_ntp_browsertest.js

 // Copyright 2013 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.
 
 
 /**
  * @fileoverview Tests the local NTP.
  */
 
 
@@ skipping 90 matching lines @@
 /**
  * Tests that non-Google NTPs do not show a fakebox.
  */
 function testDoesNotShowFakeboxIfNotGoogle() {
   initLocalNTP(/*isGooglePage=*/false);
   assert(!elementIsVisible($('fakebox')));
   assert(!elementIsVisible($('logo')));
 }
 
 
+/**
+ * Tests that the embeddedSearch.newTabPage.mostVisited API is hooked up, and
+ * provides the correct data for the tiles (i.e. only IDs, no URLs).
+ */
+function testMostVisitedContents() {
+  // Check that the API is available and properly hooked up, so that it returns
+  // some data (see history::PrepopulatedPageList for the default contents).
+  assert(window.chrome.embeddedSearch.newTabPage.mostVisited.length > 0);
+
+  // Check that the items have the required fields: We expect a "restricted ID"
+  // (rid), but there mustn't be url, title, etc. Those are only available
+  // through getMostVisitedItemData(rid).
+  for (var mvItem of window.chrome.embeddedSearch.newTabPage.mostVisited) {
+    assert(isFinite(mvItem.rid));
+    assert(!mvItem.url);
+    assert(!mvItem.title);
+    assert(!mvItem.domain);
+  }
+
+  // Try to get an item's details via getMostVisitedItemData. This should fail,
+  // because that API is only available to the MV iframe.
+  assert(!window.chrome.embeddedSearch.newTabPage.getMostVisitedItemData(
+      window.chrome.embeddedSearch.newTabPage.mostVisited[0].rid));
+}
+
+
 
 // ****************************** ADVANCED TESTS ******************************
 // Advanced tests are controlled from the native side. The helpers here are
 // called from native code to set up the page and to check results.
 
 function setupAdvancedTest() {
   setUp();
   initLocalNTP(/*isGooglePage=*/true);
 
   assert(elementIsVisible($('fakebox')));
@@ skipping 14 matching lines @@
 }
 
 function fakeboxIsVisible() {
   return elementIsVisible($('fakebox'));
 }
 
 function fakeboxIsFocused() {
   return fakeboxIsVisible() &&
       document.body.classList.contains('fakebox-focused');
 }