Support numbers in settings-checkbox

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 48 matching lines @@
       test('does not change when disabled', function() {
         testElement.checked = false;
         testElement.setAttribute('disabled', '');
         assertTrue(testElement.disabled);
         assertTrue(testElement.$.checkbox.disabled);
 
         MockInteractions.tap(testElement.$.checkbox);
         assertFalse(testElement.checked);
         assertFalse(testElement.$.checkbox.checked);
       });
+
+      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');
+        assertFalse(testElement.checked);
+        assertEquals(0, prefNum.value);
+
+        testElement.setAttribute('checked', '');
+        assertTrue(testElement.checked);
+        assertEquals(1, prefNum.value);
+      });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });