bluetooth: Basic browser tests for chrome://bluetooth-internals.

chrome/browser/resources/bluetooth_internals/interfaces.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.
 
 /**
  * Javascript for Mojo interface helpers and global variables, served from
  *     chrome://bluetooth-internals/.
  */
 
 cr.define('interfaces', function() {
-
-  /**
-   * TODO(crbug.com/652361): Move to shared location.
-   * Helper to convert callback-based define() API to a promise-based API.
-   * @param {!Array<string>} moduleNames
-   * @return {!Promise}
-   */
-  function importModules(moduleNames) {
-    return new Promise(function(resolve, reject) {
-      define(moduleNames, function(var_args) {
-        resolve(Array.prototype.slice.call(arguments, 0));
-      });
-    });
-  }
-
   /**
    * Initializes Mojo proxies for page and Bluetooth services.
    * @return {!Promise} resolves if adapter is acquired, rejects if Bluetooth
    *     is not supported.
    */
   function initializeProxies() {
     return importModules([
       'content/public/renderer/frame_interfaces',
       'device/bluetooth/public/interfaces/adapter.mojom',
       'device/bluetooth/public/interfaces/device.mojom',
@@ skipping 20 matching lines @@
       adapter = interfaces.Connection.bindHandleToProxy(
           response.adapter,
           interfaces.BluetoothAdapter.Adapter);
 
       Object.assign(interfaces, {
         DefaultAdapter: adapter,
       });
     });
   }
 
+  /**
+  * Overriden by tests to give them a chance to setup a fake Mojo browser proxy
+  * before any other code executes.
+  * @return {!Promise} A promise firing once necessary setup has been completed.
+  */
+  var setupFn = window.setupFn || function() { return Promise.resolve(); };
+
+  function initialize() {
+    return setupFn().then(initializeProxies);
+  }
+
   return {
-    initialize: initializeProxies,
+    initialize: initialize,
   };
 });