Added unpacking step

chrome/installer/mac/app/testing/Unpacker_test.mm

+// 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.
+
+#import "chrome/installer/mac/app/Unpacker.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#import "chrome/installer/mac/app/Downloader.h"
+
+dispatch_semaphore_t mount_semaphore;
+
+@interface TestDelegate : NSObject<UnpackDelegate>
+@end
+
+@implementation TestDelegate
+- (void)onUnpackSuccess {
+  NSFileManager* fileManager = [NSFileManager defaultManager];
+
+  if ([fileManager removeItemAtPath:@"/Applications/Google Chromo.app"

[Elly Fong-Jones, 2016/08/16 15:26:18]

Chrome :)

[Anna Zeng, 2016/08/16 23:07:40]

Acknowledged.

+                              error:nil]) {
+    NSLog(@"Application removed!");
+  }
+
+  NSLog(@"test succeeded");
+  dispatch_semaphore_signal(mount_semaphore);
+}
+@end
+
+namespace {
+
+// TODO: edit the below test to work with the current protocol
+TEST(UnpackerTest, MountAndUnmount) {
+  Unpacker* unpack = [[Unpacker alloc]
+      // NOTE: purposefully misspelled Chrome in order to avoid overwriting the
+      // current machine's Google Chrome installation.
+      initWithFinalAppPath:@"/Applications/Google Chromo.app"];

[Sidney San Martín, 2016/08/13 12:37:19]

It would be better if the test used a temporary folder instead of putting stuff
in /Applications.

[Anna Zeng, 2016/08/16 23:07:40]

Good point! Done.

+  TestDelegate* test_delegate = [[TestDelegate alloc] init];
+  unpack.delegate = test_delegate;
+  mount_semaphore = dispatch_semaphore_create(0);
+
+  [unpack mountDMG];
+
+  DASessionRef session = DASessionCreate(nil);
+  DADiskRef child_disk = DADiskCreateFromVolumePath(
+      nil, session,
+      (CFURLRef)[NSURL URLWithString:PATH_FROM_EXECUTABLE(@"tmp")]);
+  DADiskRef whole_disk = DADiskCopyWholeDisk(child_disk);
+
+  CFDictionaryRef disk_dictionary = DADiskCopyDescription(whole_disk);
+  CFTypeRef mediaEjectableKey = CFDictionaryGetValue(
+      disk_dictionary, kDADiskDescriptionMediaEjectableKey);
+  ASSERT_TRUE(CFBooleanGetValue((CFBooleanRef)mediaEjectableKey));

[Sidney San Martín, 2016/08/13 12:37:19]

It would be way simpler to just look for a file (like "Google Chrome.app")
inside the mountpoint, no DA calls needed.

[Anna Zeng, 2016/08/16 23:07:40]

Done.

+  CFRelease(whole_disk);
+  CFRelease(child_disk);
+
+  [unpack unmountDMG];
+  dispatch_semaphore_wait(mount_semaphore, DISPATCH_TIME_FOREVER);
+
+  DADiskRef disk_check = DADiskCreateFromVolumePath(
+      nil, session,
+      (CFURLRef)[NSURL URLWithString:PATH_FROM_EXECUTABLE(@"tmp")]);
+  EXPECT_FALSE(disk_check);

[Sidney San Martín, 2016/08/13 12:37:19]

Ditto.

[Anna Zeng, 2016/08/16 23:07:40]

Done.

+}
+
+}  // namespace