Adds API test for imageWriterPrivate.writeFromFile

chrome/test/data/extensions/api_test/image_writer_private/write_from_file/test.js

Index: chrome/test/data/extensions/api_test/image_writer_private/write_from_file/test.js
diff --git a/chrome/test/data/extensions/api_test/image_writer_private/write_from_file/test.js b/chrome/test/data/extensions/api_test/image_writer_private/write_from_file/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..ba9c23a8a447e6e9b3bfad7d42f1b69d88bcc789
--- /dev/null
+++ b/chrome/test/data/extensions/api_test/image_writer_private/write_from_file/test.js
@@ -0,0 +1,71 @@
+// 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.
+
+function assertNotNullOrUndefined(value, message) {
+  chrome.test.assertTrue(value !== null, message);
+  chrome.test.assertTrue(value !== undefined, message);
+}
+
+function testWriteFromFile() {
+  var fileEntry;
+  var storageDevice;
+  var currentStage = "none";
+  var currentProgress = -1;
+  var started = true;
+
+  function chooseEntryCallback(entry) {
+    fileEntry = entry;
+
+    chrome.imageWriterPrivate.listRemovableStorageDevices(
+        listDevicesCallback);
+  }
+
+  function listDevicesCallback(deviceList) {
+    chrome.test.assertTrue(deviceList.length >= 1);
+    storageDevice = deviceList[0];
+
+    startWrite();
+  }
+
+  function startWrite() {
+    assertNotNullOrUndefined(fileEntry, "FileEntry should be defined.");
+    assertNotNullOrUndefined(
+        storageDevice.storageUnitId, "Storage Unit should be defined.");
+
+    chrome.imageWriterPrivate.writeFromFile(
+        storageDevice.storageUnitId,
+        fileEntry,
+        startWriteCallback);
+  }
+
+  function startWriteCallback() {
+    started = true;
+  }
+
+  function writeProgressCallback(progressInfo) {
+    currentProgress = progressInfo.percentComplete;
+    currentStage = progressInfo.stage;
+  }
+
+  function writeCompleteCallback() {
+    chrome.test.assertTrue(started, "Complete triggered before being started.");
+    chrome.test.assertEq(100, currentProgress);
+    chrome.test.succeed("Write completed successfully.");
+  }
+
+  function writeErrorCallback(message) {
+    chrome.test.fail("An error occurred during writing.");
+  }
+
+  chrome.imageWriterPrivate.onWriteProgress.
+      addListener(writeProgressCallback);
+  chrome.imageWriterPrivate.onWriteComplete.
+      addListener(writeCompleteCallback);
+  chrome.imageWriterPrivate.onWriteError.
+      addListener(writeErrorCallback);
+
+  chrome.fileSystem.chooseEntry(chooseEntryCallback);
+}
+
+testWriteFromFile();