Reland: MD Settings: Fix the Network Prediction toggle box.

chrome/test/data/webui/settings/checkbox_tests.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 settings-checkbox. */
 cr.define('settings_checkbox', function() {
   function registerTests() {
     suite('SettingsCheckbox', function() {
       /**
        * Checkbox created before each test.
@@ skipping 12 matching lines @@
       };
 
       // Initialize a checked settings-checkbox before each test.
       setup(function() {
         PolymerTest.clearBody();
         testElement = document.createElement('settings-checkbox');
         testElement.set('pref', pref);
         document.body.appendChild(testElement);
       });
 
-      test('responds to checked attribute', function() {
+      test('value changes on tap', function() {
         assertTrue(testElement.checked);
 
-        testElement.removeAttribute('checked');
+        MockInteractions.tap(testElement.$.checkbox);
         assertFalse(testElement.checked);
         assertFalse(pref.value);
 
-        testElement.setAttribute('checked', '');
+        MockInteractions.tap(testElement.$.checkbox);
         assertTrue(testElement.checked);
         assertTrue(pref.value);
       });
 
       test('fires a change event', function(done) {
         testElement.addEventListener('change', function() {
           assertFalse(testElement.checked);
           done();
         });
         MockInteractions.tap(testElement.$.checkbox);
@@ skipping 13 matching lines @@
       test('numerical pref', function() {
         var prefNum = {
           key: 'test',
           type: chrome.settingsPrivate.PrefType.NUMBER,
           value: 1
         };
 
         testElement.set('pref', prefNum);
         assertTrue(testElement.checked);
 
-        testElement.removeAttribute('checked');
+        MockInteractions.tap(testElement.$.checkbox);
         assertFalse(testElement.checked);
         assertEquals(0, prefNum.value);
 
-        testElement.setAttribute('checked', '');
+        MockInteractions.tap(testElement.$.checkbox);
         assertTrue(testElement.checked);
         assertEquals(1, prefNum.value);
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });