MD Settings: Lazy-load sub-pages.

chrome/test/data/webui/settings/basic_page_browsertest.js

 // Copyright 2015 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 Suite of tests for the Settings basic page. */
 
 GEN_INCLUDE(['settings_page_browsertest.js']);
 
 /**
  * @constructor
  * @extends {SettingsPageBrowserTest}
 */
 function SettingsBasicPageBrowserTest() {}
 
 SettingsBasicPageBrowserTest.prototype = {
   __proto__: SettingsPageBrowserTest.prototype
 };
 
 // Times out on debug builders and may time out on memory bots because
 // the Settings page can take several seconds to load in a Release build
 // and several times that in a Debug build. See https://crbug.com/558434.
 GEN('#if defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
-GEN('#define MAYBE_Load DISABLED_Main');
+GEN('#define MAYBE_Load DISABLED_Load');
 GEN('#else');
-GEN('#define MAYBE_Load Main');
+GEN('#define MAYBE_Load Load');
 GEN('#endif');
 
 TEST_F('SettingsBasicPageBrowserTest', 'MAYBE_Load', function() {
   // Assign |self| to |this| instead of binding since 'this' in suite()
   // and test() will be a Mocha 'Suite' or 'Test' instance.
   var self = this;
 
   // Register mocha tests.
   suite('SettingsPage', function() {
     test('load page', function() {
       // This will fail if there are any asserts or errors in the Settings page.
     });
 
     test('basic pages', function() {
       var page = self.getPage('basic');
+      var sections = ['appearance', 'onStartup', 'people', 'search'];
       expectTrue(!!self.getSection(page, 'appearance'));
-      expectTrue(!!self.getSection(page, 'onStartup'));
-      expectTrue(!!self.getSection(page, 'people'));
-      expectTrue(!!self.getSection(page, 'search'));
-      if (!cr.isChromeOS) {
-        expectTrue(!!self.getSection(page, 'defaultBrowser'));
-      } else {
-        expectTrue(!!self.getSection(page, 'internet'));
-        expectTrue(!!self.getSection(page, 'device'));
+      if (!cr.isChromeOS)
+        sections.push('defaultBrowser');
+      else
+        sections = sections.concat(['internet', 'device']);
+
+      for (var i = 0; i < sections.length; i++) {
+        var section = self.getSection(page, sections[i]);
+        expectTrue(!!section);
+        self.verifySubpagesHidden(section);
       }
     });
   });
 
   // Run all registered tests.
   mocha.run();
 });