[fsp] Simplify browser tests by extracting the common code.

chrome/test/data/extensions/api_test/file_system_provider/unmount/test.js

 // Copyright 2014 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.
 
 'use strict';
 
 /**
  * @type {string}
  * @const
  */
 var FIRST_FILE_SYSTEM_ID = 'vanilla';
 
 /**
  * @type {string}
  * @const
  */
 var SECOND_FILE_SYSTEM_ID = 'ice-cream';
 
 /**
- * Gets volume information for the provided file system.
- *
- * @param {string} fileSystemId Id of the provided file system.
- * @param {function(Object)} callback Callback to be called on result, with the
- *     volume information object in case of success, or null if not found.
- */
-function getVolumeInfo(fileSystemId, callback) {
-  chrome.fileBrowserPrivate.getVolumeMetadataList(function(volumeList) {
-    for (var i = 0; i < volumeList.length; i++) {
-      if (volumeList[i].extensionId == chrome.runtime.id &&
-          volumeList[i].fileSystemId == fileSystemId) {
-        callback(volumeList[i]);
-        return;
-      }
-    }
-    callback(null);
-  });
-}
-
-/**
  * Sets up the tests. Called once per all test cases. In case of a failure,
  * the callback is not called.
  *
  * @param {function()} callback Success callback.
  */
 function setUp(callback) {
   Promise.race([
     new Promise(function(fulfill, reject) {
       chrome.fileSystemProvider.mount(
           {fileSystemId: FIRST_FILE_SYSTEM_ID, displayName: 'vanilla.zip'},
@@ skipping 71 matching lines @@
         // Not calling fileSystemProvider.unmount(), so the onMountCompleted
         // event will not be raised.
         chrome.fileSystemProvider.onUnmountRequested.removeListener(
             onUnmountRequested);
         onTestSuccess();
       };
 
       chrome.fileSystemProvider.onUnmountRequested.addListener(
           onUnmountRequested);
 
-      getVolumeInfo(SECOND_FILE_SYSTEM_ID, function(volumeInfo) {
+      test_util.getVolumeInfo(SECOND_FILE_SYSTEM_ID, function(volumeInfo) {
         chrome.test.assertTrue(!!volumeInfo);
         chrome.fileBrowserPrivate.removeMount(volumeInfo.volumeId);
       });
     },
 
     // End to end test with a failure. Invokes fileSystemProvider.removeMount()
     // on a provided file system, and verifies (1) if the onMountRequested()
     // event is called with correct aguments, and (2) if calling onError(),
     // results in an unmount event fired from the VolumeManager instance.
     function requestUnmountError() {
@@ skipping 22 matching lines @@
         chrome.fileBrowserPrivate.removeMount(SECOND_FILE_SYSTEM_ID);
         chrome.fileBrowserPrivate.onMountCompleted.removeListener(
             onMountCompleted);
         onTestSuccess();
       };
 
       chrome.fileSystemProvider.onUnmountRequested.addListener(
           onUnmountRequested);
       chrome.fileBrowserPrivate.onMountCompleted.addListener(onMountCompleted);
 
-      getVolumeInfo(SECOND_FILE_SYSTEM_ID, function(volumeInfo) {
+      test_util.getVolumeInfo(SECOND_FILE_SYSTEM_ID, function(volumeInfo) {
         chrome.test.assertTrue(!!volumeInfo);
         chrome.fileBrowserPrivate.removeMount(volumeInfo.volumeId);
       });
     }
   ]);
 }
 
 // Setup and run all of the test cases.
 setUp(runTests);