MD Settings: Allow the user to order the list of languages.

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

 // Copyright 2016 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.
 
 cr.define('settings_languages_page', function() {
   suite('settings-languages-singleton', function() {
     var languageSettingsPrivate;
     var languageHelper;
     var settingsPrefs;
     var fakePrefs = [{
@@ skipping 72 matching lines @@
       assertFalse(languageHelper.isLanguageEnabled('en-CA'));
 
       languageHelper.enableLanguage('en-CA');
       assertTrue(languageHelper.isLanguageEnabled('en-CA'));
       languageHelper.disableLanguage('sw');
       assertFalse(languageHelper.isLanguageEnabled('sw'));
 
       // TODO(michaelpg): Test other modifications.
     });
 
+    test('reorder languages', function() {
+      languageHelper.enableLanguage('sw');
+      assertEquals('en-US', languageHelper.languages.enabled[0].language.code);
+      assertEquals('en-CA', languageHelper.languages.enabled[1].language.code);
+      assertEquals('sw', languageHelper.languages.enabled[2].language.code);
+
+      // Can move a language up.
+      languageHelper.moveLanguage('sw', -1);
+      assertEquals('en-US', languageHelper.languages.enabled[0].language.code);
+      assertEquals('sw', languageHelper.languages.enabled[1].language.code);
+      assertEquals('en-CA', languageHelper.languages.enabled[2].language.code);
+
+      // Can move a language down.
+      languageHelper.moveLanguage('en-US', 1);
+      assertEquals('sw', languageHelper.languages.enabled[0].language.code);
+      assertEquals('en-US', languageHelper.languages.enabled[1].language.code);
+      assertEquals('en-CA', languageHelper.languages.enabled[2].language.code);
+
+      // Moving the first language up has no effect.
+      languageHelper.moveLanguage('sw', -1);
+      assertEquals('sw', languageHelper.languages.enabled[0].language.code);
+      assertEquals('en-US', languageHelper.languages.enabled[1].language.code);
+      assertEquals('en-CA', languageHelper.languages.enabled[2].language.code);
+
+      // Moving the last language down has no effect.
+      languageHelper.moveLanguage('en-CA', 1);
+      assertEquals('sw', languageHelper.languages.enabled[0].language.code);
+      assertEquals('en-US', languageHelper.languages.enabled[1].language.code);
+      assertEquals('en-CA', languageHelper.languages.enabled[2].language.code);
+    });
+
     if (cr.isChromeOS) {
       test('modifying input methods', function() {
         assertEquals(2, languageHelper.languages.inputMethods.enabled.length);
         var inputMethods = languageHelper.getInputMethodsForLanguage('en-US');
         assertEquals(2, inputMethods.length);
 
         var dvorak =
             '_comp_ime_fgoepimhcoialccpbmpnnblemnepkkaoxkb:us:dvorak:eng';
         languageHelper.removeInputMethod(dvorak);
         assertEquals(1, languageHelper.languages.inputMethods.enabled.length);
 
         // TODO(michaelpg): Test other modifications.
       });
     }
   });
 });