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

chrome/test/data/extensions/api_test/file_system_provider/big_file/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 {DOMFileSystem}
  */
 var fileSystem = null;
 
 /**
  * Map of opened files, from a <code>openRequestId</code> to <code>filePath
  * </code>.
  * @type {Object.<number, string>}
  */
 var openedFiles = {};
 
 /**
  * @type {string}
  * @const
  */
-var FILE_SYSTEM_ID = 'chocolate-id';
-
-/**
- * @type {string}
- * @const
- */
 var TESTING_TEXT = 'We are bytes at the 5th GB of the file!';
 
 /**
  * @type {number}
  * @const
  */
 var TESTING_TEXT_OFFSET = 5 * 1000 * 1000 * 1000;
 
 /**
  * @type {Object}
@@ skipping 12 matching lines @@
  * @const
  */
 var TESTING_6GB_FILE = Object.freeze({
   isDirectory: false,
   name: '6gb.txt',
   size: 6 * 1024 * 1024 * 1024,
   modificationTime: new Date(2014, 1, 25, 7, 36, 12)
 });
 
 /**
- * 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);
-  });
-}
-
-/**
  * Returns metadata for the requested entry.
  *
  * To successfully acquire a DirectoryEntry, or even a DOMFileSystem, this event
  * must be implemented and return correct values.
  *
  * @param {GetMetadataRequestedOptions} options Options.
  * @param {function(Object)} onSuccess Success callback with metadata passed
  *     an argument.
  * @param {function(string)} onError Error callback with an error code.
  */
 function onGetMetadataRequested(options, onSuccess, onError) {
-  if (options.fileSystemId != FILE_SYSTEM_ID) {
+  if (options.fileSystemId != test_util.FILE_SYSTEM_ID) {
     onError('INVALID_OPERATION');  // enum ProviderError.
     return;
   }
 
   if (options.entryPath == '/') {
     onSuccess(TESTING_ROOT);
     return;
   }
 
   if (options.entryPath == '/' + TESTING_6GB_FILE.name) {
     onSuccess(TESTING_6GB_FILE);
     return;
   }
 
   onError('NOT_FOUND');  // enum ProviderError.
 }
 
 /**
  * Requests opening a file at <code>filePath</code>. Further file operations
  * will be associated with the <code>requestId</code>
  *
  * @param {OpenFileRequestedOptions} options Options.
  * @param {function()} onSuccess Success callback.
  * @param {function(string)} onError Error callback.
  */
 function onOpenFileRequested(options, onSuccess, onError) {
-  if (options.fileSystemId != FILE_SYSTEM_ID) {
+  if (options.fileSystemId != test_util.FILE_SYSTEM_ID) {
     onError('INVALID_OPERATION');  // enum ProviderError.
     return;
   }
 
   if (options.mode != 'READ' || options.create) {
     onError('ACCESS_DENIED');  // enum ProviderError.
     return;
   }
 
   if (options.filePath != '/' + TESTING_6GB_FILE.name) {
     onError('NOT_FOUND');  // enum ProviderError.
     return;
   }
 
   openedFiles[options.requestId] = options.filePath;
   onSuccess();
 }
 
 /**
  * Requests closing a file previously opened with <code>openRequestId</code>.
  *
  * @param {CloseFileRequestedOptions} options Options.
  * @param {function()} onSuccess Success callback.
  * @param {function(string)} onError Error callback.
  */
 function onCloseFileRequested(options, onSuccess, onError) {
-  if (options.fileSystemId != FILE_SYSTEM_ID ||
+  if (options.fileSystemId != test_util.FILE_SYSTEM_ID ||
       !openedFiles[options.openRequestId]) {
     onError('INVALID_OPERATION');  // enum ProviderError.
     return;
   }
 
   delete openedFiles[options.openRequestId];
   onSuccess();
 }
 
 /**
  * Requests reading contents of a file, previously opened with <code>
  * openRequestId</code>.
  *
  * @param {ReadFileRequestedOptions} options Options.
  * @param {function(ArrayBuffer, boolean)} onSuccess Success callback with a
  *     chunk of data, and information if more data will be provided later.
  * @param {function(string)} onError Error callback.
  */
 function onReadFileRequested(options, onSuccess, onError) {
   var filePath = openedFiles[options.openRequestId];
-  if (options.fileSystemId != FILE_SYSTEM_ID || !filePath) {
+  if (options.fileSystemId != test_util.FILE_SYSTEM_ID || !filePath) {
     onError('INVALID_OPERATION');  // enum ProviderError.
     return;
   }
 
   if (filePath == '/' + TESTING_6GB_FILE.name) {
     if (options.offset < TESTING_TEXT_OFFSET ||
         options.offset + options.length >
             TESTING_TEXT_OFFSET + TESTING_TEXT.length) {
       console.error('Reading from a wrong location in the file!');
       onError('INVALID_FAILED');  // enum ProviderError.
@@ skipping 13 matching lines @@
   onError('INVALID_OPERATION');  // enum ProviderError.
 }
 
 /**
  * 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) {
-  chrome.fileSystemProvider.mount(
-      {fileSystemId: FILE_SYSTEM_ID, displayName: 'chocolate.zip'},
-      function() {
-        chrome.fileSystemProvider.onGetMetadataRequested.addListener(
-            onGetMetadataRequested);
-        chrome.fileSystemProvider.onOpenFileRequested.addListener(
-            onOpenFileRequested);
-        chrome.fileSystemProvider.onReadFileRequested.addListener(
-            onReadFileRequested);
-        var volumeId =
-            'provided:' + chrome.runtime.id + '-' + FILE_SYSTEM_ID + '-user';
-
-        getVolumeInfo(FILE_SYSTEM_ID, function(volumeInfo) {
-          chrome.test.assertTrue(!!volumeInfo);
-          chrome.fileBrowserPrivate.requestFileSystem(
-              volumeInfo.volumeId,
-              function(inFileSystem) {
-                chrome.test.assertTrue(!!inFileSystem);
-
-                fileSystem = inFileSystem;
-                callback();
-              });
-        });
-      }, function() {
-        chrome.test.fail();
-      });
+  chrome.fileSystemProvider.onGetMetadataRequested.addListener(
+      onGetMetadataRequested);
+  chrome.fileSystemProvider.onOpenFileRequested.addListener(
+      onOpenFileRequested);
+  chrome.fileSystemProvider.onReadFileRequested.addListener(
+      onReadFileRequested);
+  chrome.fileSystemProvider.onCloseFileRequested.addListener(
+      onCloseFileRequested);
+  test_util.mountFileSystem(callback);
 }
 
 /**
  * Runs all of the test cases, one by one.
  */
 function runTests() {
   chrome.test.runTests([
     // Read contents of a new file, which is 6GB in size. Such size does not
     // fit in a 32bit int nor in size_t (unsigned). It should be safe to assume,
     // that if 6GB are supported, then there is no 32bit bottle neck, and the
     // next one would be 64bit. File System Provider API should support files
     // with size greater or equal to 2^53.
     function readBigFileSuccess() {
       var onTestSuccess = chrome.test.callbackPass();
-      fileSystem.root.getFile(
+      test_util.fileSystem.root.getFile(
           TESTING_6GB_FILE.name,
           {create: false},
           function(fileEntry) {
             fileEntry.file(function(file) {
               // Read 10 bytes from the 5th GB.
               var fileSlice =
                   file.slice(TESTING_TEXT_OFFSET,
                              TESTING_TEXT_OFFSET + TESTING_TEXT.length);
               var fileReader = new FileReader();
               fileReader.onload = function(e) {
@@ skipping 12 matching lines @@
           },
           function(error) {
             chrome.test.fail(error.name);
           });
     }
   ]);
 }
 
 // Setup and run all of the test cases.
 setUp(runTests);