WebUI: Add cr_policy_network_indicator_tests.js

chrome/test/data/webui/cr_elements/cr_elements_browsertest.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.
 
 /** @fileoverview Tests for shared Polymer elements. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 138 matching lines @@
     // chrome.settingsPrivate.PrefType.
     '../../../../../third_party/closure_compiler/externs/settings_private.js',
     'cr_policy_pref_indicator_tests.js',
   ]),
 };
 
 TEST_F('CrElementsPolicyPrefIndicatorTest', 'All', function() {
   cr_policy_pref_indicator.registerTests();
   mocha.run();
 });
+
+function CrElementsPolicyNetworkIndicatorTest() {}
+
+CrElementsPolicyNetworkIndicatorTest.prototype = {
+  __proto__: CrElementsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload:
+      'chrome://resources/cr_elements/policy/cr_policy_network_indicator.html',
+
+  /** @override */
+  extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    // networking_private  and settings_private.js are needed just to define
+    // types, e.g. chrome.settingsPrivate.NetworkType.
+    '../../../../../third_party/closure_compiler/externs/networking_private.js',
+    '../../../../../third_party/closure_compiler/externs/settings_private.js',

[Dan Beam, 2017/01/12 18:18:18]

actually running externs is a poor practice and is not guaranteed to work in the
future.

for example, chrome_extensions.js does this:

if (Math.random() < 1) {  // always succeeds
  throw "don't load externs as script";
}

https://cs.chromium.org/chromium/src/third_party/closure_compiler/externs/chr...

this seems like a good practice and might come to a externs generator near you
soon ;)

additionally, this means that the code relies on settingsPrivate tightly :(

+    'cr_policy_network_indicator_tests.js',
+  ]),
+};
+
+TEST_F('CrElementsPolicyNetworkIndicatorTest', 'All', function() {
+  cr_policy_network_indicator.registerTests();
+  mocha.run();
+});