chrome/test/base/in_process_browser_test.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/test/base/in_process_browser_test.h"
   6
   7 #include "base/auto_reset.h"
   8 #include "base/basictypes.h"
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/files/file_path.h"
  12 #include "base/files/file_util.h"
  13 #include "base/lazy_instance.h"
  14 #include "base/path_service.h"
  15 #include "base/strings/string_number_conversions.h"
  16 #include "base/test/test_file_util.h"
  17 #include "base/threading/non_thread_safe.h"
  18 #include "chrome/browser/browser_process.h"
  19 #include "chrome/browser/lifetime/application_lifetime.h"
  20 #include "chrome/browser/net/net_error_tab_helper.h"
  21 #include "chrome/browser/profiles/profile.h"
  22 #include "chrome/browser/profiles/profile_manager.h"
  23 #include "chrome/browser/ui/browser.h"
  24 #include "chrome/browser/ui/browser_finder.h"
  25 #include "chrome/browser/ui/browser_list.h"
  26 #include "chrome/browser/ui/browser_list_observer.h"
  27 #include "chrome/browser/ui/browser_navigator.h"
  28 #include "chrome/browser/ui/browser_tabstrip.h"
  29 #include "chrome/browser/ui/browser_window.h"
  30 #include "chrome/browser/ui/host_desktop.h"
  31 #include "chrome/browser/ui/tabs/tab_strip_model.h"
  32 #include "chrome/common/chrome_constants.h"
  33 #include "chrome/common/chrome_paths.h"
  34 #include "chrome/common/chrome_switches.h"
  35 #include "chrome/common/logging_chrome.h"
  36 #include "chrome/common/url_constants.h"
  37 #include "chrome/renderer/chrome_content_renderer_client.h"
  38 #include "chrome/test/base/chrome_test_suite.h"
  39 #include "chrome/test/base/test_launcher_utils.h"
  40 #include "chrome/test/base/test_switches.h"
  41 #include "chrome/test/base/testing_browser_process.h"
  42 #include "components/google/core/browser/google_util.h"
  43 #include "components/os_crypt/os_crypt.h"
  44 #include "content/public/browser/notification_service.h"
  45 #include "content/public/browser/notification_types.h"
  46 #include "content/public/test/browser_test_utils.h"
  47 #include "content/public/test/test_launcher.h"
  48 #include "content/public/test/test_navigation_observer.h"
  49 #include "net/test/embedded_test_server/embedded_test_server.h"
  50 #include "net/test/spawned_test_server/spawned_test_server.h"
  51
  52 #if defined(OS_MACOSX)
  53 #include "base/mac/scoped_nsautorelease_pool.h"
  54 #endif
  55
  56 #if defined(OS_WIN)
  57 #include "base/win/scoped_com_initializer.h"
  58 #include "base/win/windows_version.h"
  59 #include "ui/base/win/atl_module.h"
  60 #include "win8/test/metro_registration_helper.h"
  61 #include "win8/test/test_registrar_constants.h"
  62 #endif
  63
  64 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
  65 #include "chrome/browser/captive_portal/captive_portal_service.h"
  66 #endif
  67
  68 #if !defined(OS_ANDROID) && !defined(OS_IOS)
  69 #include "components/storage_monitor/test_storage_monitor.h"
  70 #endif
  71
  72 #if defined(OS_CHROMEOS)
  73 #include "chrome/browser/chromeos/input_method/input_method_configuration.h"
  74 #endif
  75
  76 namespace {
  77
  78 // Passed as value of kTestType.
  79 const char kBrowserTestType[] = "browser";
  80
  81 // A BrowserListObserver that makes sure that all browsers created are on the
  82 // |allowed_desktop_|.
  83 class SingleDesktopTestObserver : public chrome::BrowserListObserver,
  84                                   public base::NonThreadSafe {
  85  public:
  86   explicit SingleDesktopTestObserver(chrome::HostDesktopType allowed_desktop);
  87   ~SingleDesktopTestObserver() override;
  88
  89   // chrome::BrowserListObserver:
  90   void OnBrowserAdded(Browser* browser) override;
  91
  92  private:
  93   chrome::HostDesktopType allowed_desktop_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(SingleDesktopTestObserver);
  96 };
  97
  98 SingleDesktopTestObserver::SingleDesktopTestObserver(
  99     chrome::HostDesktopType allowed_desktop)
 100         : allowed_desktop_(allowed_desktop) {
 101   BrowserList::AddObserver(this);
 102 }
 103
 104 SingleDesktopTestObserver::~SingleDesktopTestObserver() {
 105   BrowserList::RemoveObserver(this);
 106 }
 107
 108 void SingleDesktopTestObserver::OnBrowserAdded(Browser* browser) {
 109   CHECK(CalledOnValidThread());
 110   CHECK_EQ(browser->host_desktop_type(), allowed_desktop_);
 111 }
 112
 113 }  // namespace
 114
 115 // Library used for testing accessibility.
 116 const base::FilePath::CharType kAXSTesting[] =
 117     FILE_PATH_LITERAL("third_party/accessibility-audit/axs_testing.js");
 118 // JavaScript snippet to configure and run the accessibility audit.
 119 const char kAccessibilityTestString[] =
 120     "var config = new axs.AuditConfiguration();"
 121     "/* Disable warning about rules that cannot be checked. */"
 122     "config.showUnsupportedRulesWarning = false;"
 123     "config.auditRulesToIgnore = ["
 124     "  /*"
 125     "   * The 'elements with meaningful background image' accessibility"
 126     "   * audit (AX_IMAGE_01) does not apply, since Chrome doesn't"
 127     "   * disable background images in high-contrast mode like some"
 128     "   * browsers do."
 129     "   */"
 130     "  'elementsWithMeaningfulBackgroundImage',"
 131     "  /*"
 132     "   * Most WebUI pages are inside an IFrame, so the 'web page should"
 133     "   * have a title that describes topic or purpose' test (AX_TITLE_01)"
 134     "   * generally does not apply."
 135     "   */"
 136     "  'pageWithoutTitle',"
 137     "  /*"
 138     "   * Enable when crbug.com/267035 is fixed."
 139     "   * Until then it's just noise."
 140     "   */"
 141     "  'lowContrastElements'"
 142     "];"
 143     "var result = axs.Audit.run(config);"
 144     "var error = '';"
 145     "for (var i = 0; i < result.length; ++i) {"
 146     "  if (result[i].result == axs.constants.AuditResult.FAIL) {"
 147     "    error = axs.Audit.createReport(result);"
 148     "    break;"
 149     "  }"
 150     "}"
 151     "domAutomationController.send(error);";
 152
 153 InProcessBrowserTest::InProcessBrowserTest()
 154     : browser_(NULL),
 155       exit_when_last_browser_closes_(true),
 156       open_about_blank_on_browser_launch_(true),
 157       multi_desktop_test_(false),
 158       run_accessibility_checks_for_test_case_(false)
 159 #if defined(OS_MACOSX)
 160       , autorelease_pool_(NULL)
 161 #endif  // OS_MACOSX
 162     {
 163 #if defined(OS_MACOSX)
 164   // TODO(phajdan.jr): Make browser_tests self-contained on Mac, remove this.
 165   // Before we run the browser, we have to hack the path to the exe to match
 166   // what it would be if Chrome was running, because it is used to fork renderer
 167   // processes, on Linux at least (failure to do so will cause a browser_test to
 168   // be run instead of a renderer).
 169   base::FilePath chrome_path;
 170   CHECK(PathService::Get(base::FILE_EXE, &chrome_path));
 171   chrome_path = chrome_path.DirName();
 172   chrome_path = chrome_path.Append(chrome::kBrowserProcessExecutablePath);
 173   CHECK(PathService::Override(base::FILE_EXE, chrome_path));
 174 #endif  // defined(OS_MACOSX)
 175
 176   CreateTestServer(base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
 177   base::FilePath src_dir;
 178   CHECK(PathService::Get(base::DIR_SOURCE_ROOT, &src_dir));
 179   base::FilePath test_data_dir = src_dir.AppendASCII("chrome/test/data");
 180   embedded_test_server()->ServeFilesFromDirectory(test_data_dir);
 181
 182   // chrome::DIR_TEST_DATA isn't going to be setup until after we call
 183   // ContentMain. However that is after tests' constructors or SetUp methods,
 184   // which sometimes need it. So just override it.
 185   CHECK(PathService::Override(chrome::DIR_TEST_DATA, test_data_dir));
 186 }
 187
 188 InProcessBrowserTest::~InProcessBrowserTest() {
 189 }
 190
 191 void InProcessBrowserTest::SetUp() {
 192   // Browser tests will create their own g_browser_process later.
 193   DCHECK(!g_browser_process);
 194
 195   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 196
 197   // Auto-reload breaks many browser tests, which assume error pages won't be
 198   // reloaded out from under them. Tests that expect or desire this behavior can
 199   // append switches::kEnableOfflineAutoReload, which will override the disable
 200   // here.
 201   command_line->AppendSwitch(switches::kDisableOfflineAutoReload);
 202
 203   // Allow subclasses to change the command line before running any tests.
 204   SetUpCommandLine(command_line);
 205   // Add command line arguments that are used by all InProcessBrowserTests.
 206   PrepareTestCommandLine(command_line);
 207
 208   // Create a temporary user data directory if required.
 209   ASSERT_TRUE(CreateUserDataDirectory())
 210       << "Could not create user data directory.";
 211
 212   // Allow subclasses the opportunity to make changes to the default user data
 213   // dir before running any tests.
 214   ASSERT_TRUE(SetUpUserDataDirectory())
 215       << "Could not set up user data directory.";
 216
 217 #if defined(OS_CHROMEOS)
 218   // Make sure that the log directory exists.
 219   base::FilePath log_dir = logging::GetSessionLogFile(*command_line).DirName();
 220   base::CreateDirectory(log_dir);
 221   // Disable IME extension loading to avoid many browser tests failures.
 222   chromeos::input_method::DisableExtensionLoading();
 223 #endif  // defined(OS_CHROMEOS)
 224
 225 #if defined(OS_MACOSX)
 226   // Always use the MockKeychain if OS encription is used (which is when
 227   // anything sensitive gets stored, including Cookies).  Without this,
 228   // many tests will hang waiting for a user to approve KeyChain access.
 229   OSCrypt::UseMockKeychain(true);
 230 #endif
 231
 232 #if defined(ENABLE_CAPTIVE_PORTAL_DETECTION)
 233   CaptivePortalService::set_state_for_testing(
 234       CaptivePortalService::DISABLED_FOR_TESTING);
 235 #endif
 236
 237   chrome_browser_net::NetErrorTabHelper::set_state_for_testing(
 238       chrome_browser_net::NetErrorTabHelper::TESTING_FORCE_DISABLED);
 239
 240   google_util::SetMockLinkDoctorBaseURLForTesting();
 241
 242 #if defined(OS_WIN)
 243   base::win::Version version = base::win::GetVersion();
 244   // Although Ash officially is only supported for users on Win7+, we still run
 245   // ash_unittests on Vista builders, so we still need to initialize COM.
 246   if (version >= base::win::VERSION_VISTA &&
 247       base::CommandLine::ForCurrentProcess()->HasSwitch(
 248           switches::kAshBrowserTests)) {
 249     com_initializer_.reset(new base::win::ScopedCOMInitializer());
 250     ui::win::CreateATLModuleIfNeeded();
 251     if (version >= base::win::VERSION_WIN8)
 252       ASSERT_TRUE(win8::MakeTestDefaultBrowserSynchronously());
 253   }
 254 #endif
 255
 256   BrowserTestBase::SetUp();
 257 }
 258
 259 void InProcessBrowserTest::PrepareTestCommandLine(
 260     base::CommandLine* command_line) {
 261   // Propagate commandline settings from test_launcher_utils.
 262   test_launcher_utils::PrepareBrowserCommandLineForTests(command_line);
 263
 264   // This is a Browser test.
 265   command_line->AppendSwitchASCII(switches::kTestType, kBrowserTestType);
 266
 267 #if defined(OS_WIN)
 268   if (command_line->HasSwitch(switches::kAshBrowserTests)) {
 269     command_line->AppendSwitchNative(switches::kViewerLaunchViaAppId,
 270                                      win8::test::kDefaultTestAppUserModelId);
 271     // Ash already launches with a single browser opened, add kSilentLaunch to
 272     // make sure StartupBrowserCreator doesn't attempt to launch a browser on
 273     // the native desktop on startup.
 274     command_line->AppendSwitch(switches::kSilentLaunch);
 275   }
 276 #endif
 277
 278 #if defined(OS_MACOSX)
 279   // Explicitly set the path of the binary used for child processes, otherwise
 280   // they'll try to use browser_tests which doesn't contain ChromeMain.
 281   base::FilePath subprocess_path;
 282   PathService::Get(base::FILE_EXE, &subprocess_path);
 283   // Recreate the real environment, run the helper within the app bundle.
 284   subprocess_path = subprocess_path.DirName().DirName();
 285   DCHECK_EQ(subprocess_path.BaseName().value(), "Contents");
 286   subprocess_path =
 287       subprocess_path.Append("Versions").Append(chrome::kChromeVersion);
 288   subprocess_path =
 289       subprocess_path.Append(chrome::kHelperProcessExecutablePath);
 290   command_line->AppendSwitchPath(switches::kBrowserSubprocessPath,
 291                                  subprocess_path);
 292 #endif
 293
 294   // TODO(pkotwicz): Investigate if we can remove this switch.
 295   if (exit_when_last_browser_closes_)
 296     command_line->AppendSwitch(switches::kDisableZeroBrowsersOpenForTests);
 297
 298   if (open_about_blank_on_browser_launch_ && command_line->GetArgs().empty())
 299     command_line->AppendArg(url::kAboutBlankURL);
 300 }
 301
 302 bool InProcessBrowserTest::RunAccessibilityChecks(std::string* error_message) {
 303   if (!browser()) {
 304     *error_message = "browser is NULL";
 305     return false;
 306   }
 307   auto tab_strip = browser()->tab_strip_model();
 308   if (!tab_strip) {
 309     *error_message = "tab_strip is NULL";
 310     return false;
 311   }
 312   auto web_contents = tab_strip->GetActiveWebContents();
 313   if (!web_contents) {
 314     *error_message = "web_contents is NULL";
 315     return false;
 316   }
 317   auto focused_frame = web_contents->GetFocusedFrame();
 318   if (!focused_frame) {
 319     *error_message = "focused_frame is NULL";
 320     return false;
 321   }
 322
 323   // Load accessibility library.
 324   base::FilePath src_dir;
 325   if (!PathService::Get(base::DIR_SOURCE_ROOT, &src_dir)) {
 326     *error_message = "PathService::Get failed";
 327     return false;
 328   }
 329   base::FilePath script_path = src_dir.Append(kAXSTesting);
 330   std::string script;
 331   if (!base::ReadFileToString(script_path, &script)) {
 332     *error_message = "Could not read accessibility library";
 333     return false;
 334   }
 335   if (!content::ExecuteScript(web_contents, script)) {
 336     *error_message = "Failed to load accessibility library";
 337     return false;
 338   }
 339
 340   // Run accessibility audit.
 341   if (!content::ExecuteScriptAndExtractString(focused_frame,
 342                                               kAccessibilityTestString,
 343                                               error_message)) {
 344     *error_message = "Failed to run accessibility audit";
 345     return false;
 346   }
 347
 348   // Test result should be empty if there are no errors.
 349   return error_message->empty();
 350 }
 351
 352 bool InProcessBrowserTest::CreateUserDataDirectory() {
 353   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
 354   base::FilePath user_data_dir =
 355       command_line->GetSwitchValuePath(switches::kUserDataDir);
 356   if (user_data_dir.empty()) {
 357     if (temp_user_data_dir_.CreateUniqueTempDir() &&
 358         temp_user_data_dir_.IsValid()) {
 359       user_data_dir = temp_user_data_dir_.path();
 360     } else {
 361       LOG(ERROR) << "Could not create temporary user data directory \""
 362                  << temp_user_data_dir_.path().value() << "\".";
 363       return false;
 364     }
 365   }
 366   return test_launcher_utils::OverrideUserDataDir(user_data_dir);
 367 }
 368
 369 void InProcessBrowserTest::TearDown() {
 370   DCHECK(!g_browser_process);
 371 #if defined(OS_WIN)
 372   com_initializer_.reset();
 373 #endif
 374   BrowserTestBase::TearDown();
 375 }
 376
 377 // TODO(alexmos): This function should expose success of the underlying
 378 // navigation to tests, which should make sure navigations succeed when
 379 // appropriate. See https://crbug.com/425335
 380 void InProcessBrowserTest::AddTabAtIndexToBrowser(
 381     Browser* browser,
 382     int index,
 383     const GURL& url,
 384     ui::PageTransition transition,
 385     bool check_navigation_success) {
 386   chrome::NavigateParams params(browser, url, transition);
 387   params.tabstrip_index = index;
 388   params.disposition = NEW_FOREGROUND_TAB;
 389   chrome::Navigate(&params);
 390
 391   if (check_navigation_success)
 392     content::WaitForLoadStop(params.target_contents);
 393   else
 394     content::WaitForLoadStopWithoutSuccessCheck(params.target_contents);
 395 }
 396
 397 void InProcessBrowserTest::AddTabAtIndex(
 398     int index,
 399     const GURL& url,
 400     ui::PageTransition transition) {
 401   AddTabAtIndexToBrowser(browser(), index, url, transition, true);
 402 }
 403
 404 bool InProcessBrowserTest::SetUpUserDataDirectory() {
 405   return true;
 406 }
 407
 408 // Creates a browser with a single tab (about:blank), waits for the tab to
 409 // finish loading and shows the browser.
 410 Browser* InProcessBrowserTest::CreateBrowser(Profile* profile) {
 411   Browser* browser = new Browser(
 412       Browser::CreateParams(profile, chrome::GetActiveDesktop()));
 413   AddBlankTabAndShow(browser);
 414   return browser;
 415 }
 416
 417 Browser* InProcessBrowserTest::CreateIncognitoBrowser() {
 418   // Create a new browser with using the incognito profile.
 419   Browser* incognito = new Browser(
 420       Browser::CreateParams(browser()->profile()->GetOffTheRecordProfile(),
 421                             chrome::GetActiveDesktop()));
 422   AddBlankTabAndShow(incognito);
 423   return incognito;
 424 }
 425
 426 Browser* InProcessBrowserTest::CreateBrowserForPopup(Profile* profile) {
 427   Browser* browser =
 428       new Browser(Browser::CreateParams(Browser::TYPE_POPUP, profile,
 429                   chrome::GetActiveDesktop()));
 430   AddBlankTabAndShow(browser);
 431   return browser;
 432 }
 433
 434 Browser* InProcessBrowserTest::CreateBrowserForApp(
 435     const std::string& app_name,
 436     Profile* profile) {
 437   Browser* browser = new Browser(
 438       Browser::CreateParams::CreateForApp(
 439           app_name, false /* trusted_source */, gfx::Rect(), profile,
 440           chrome::GetActiveDesktop()));
 441   AddBlankTabAndShow(browser);
 442   return browser;
 443 }
 444
 445 void InProcessBrowserTest::AddBlankTabAndShow(Browser* browser) {
 446   content::WindowedNotificationObserver observer(
 447       content::NOTIFICATION_LOAD_STOP,
 448       content::NotificationService::AllSources());
 449   chrome::AddSelectedTabWithURL(browser,
 450                                 GURL(url::kAboutBlankURL),
 451                                 ui::PAGE_TRANSITION_AUTO_TOPLEVEL);
 452   observer.Wait();
 453
 454   browser->window()->Show();
 455 }
 456
 457 #if !defined(OS_MACOSX)
 458 base::CommandLine InProcessBrowserTest::GetCommandLineForRelaunch() {
 459   base::CommandLine new_command_line(
 460       base::CommandLine::ForCurrentProcess()->GetProgram());
 461   base::CommandLine::SwitchMap switches =
 462       base::CommandLine::ForCurrentProcess()->GetSwitches();
 463   switches.erase(switches::kUserDataDir);
 464   switches.erase(content::kSingleProcessTestsFlag);
 465   switches.erase(switches::kSingleProcess);
 466   new_command_line.AppendSwitch(content::kLaunchAsBrowser);
 467
 468   base::FilePath user_data_dir;
 469   PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
 470   new_command_line.AppendSwitchPath(switches::kUserDataDir, user_data_dir);
 471
 472   for (base::CommandLine::SwitchMap::const_iterator iter = switches.begin();
 473        iter != switches.end(); ++iter) {
 474     new_command_line.AppendSwitchNative((*iter).first, (*iter).second);
 475   }
 476   return new_command_line;
 477 }
 478 #endif
 479
 480 void InProcessBrowserTest::RunTestOnMainThreadLoop() {
 481   // Pump startup related events.
 482   content::RunAllPendingInMessageLoop();
 483
 484   chrome::HostDesktopType active_desktop = chrome::GetActiveDesktop();
 485   // Self-adds/removes itself from the BrowserList observers.
 486   scoped_ptr<SingleDesktopTestObserver> single_desktop_test_observer;
 487   if (!multi_desktop_test_) {
 488     single_desktop_test_observer.reset(
 489         new SingleDesktopTestObserver(active_desktop));
 490   }
 491
 492   const BrowserList* active_browser_list =
 493       BrowserList::GetInstance(active_desktop);
 494   if (!active_browser_list->empty()) {
 495     browser_ = active_browser_list->get(0);
 496 #if defined(USE_ASH)
 497     // There are cases where windows get created maximized by default.
 498     if (browser_->window()->IsMaximized())
 499       browser_->window()->Restore();
 500 #endif
 501     content::WaitForLoadStop(
 502         browser_->tab_strip_model()->GetActiveWebContents());
 503   }
 504
 505 #if !defined(OS_ANDROID) && !defined(OS_IOS)
 506   // Do not use the real StorageMonitor for tests, which introduces another
 507   // source of variability and potential slowness.
 508   ASSERT_TRUE(storage_monitor::TestStorageMonitor::CreateForBrowserTests());
 509 #endif
 510
 511 #if defined(OS_MACOSX)
 512   // On Mac, without the following autorelease pool, code which is directly
 513   // executed (as opposed to executed inside a message loop) would autorelease
 514   // objects into a higher-level pool. This pool is not recycled in-sync with
 515   // the message loops' pools and causes problems with code relying on
 516   // deallocation via an autorelease pool (such as browser window closure and
 517   // browser shutdown). To avoid this, the following pool is recycled after each
 518   // time code is directly executed.
 519   autorelease_pool_ = new base::mac::ScopedNSAutoreleasePool;
 520 #endif
 521
 522   // Pump any pending events that were created as a result of creating a
 523   // browser.
 524   content::RunAllPendingInMessageLoop();
 525
 526   // run_accessibility_checks_for_test_case_ must be set before calling
 527   // SetUpOnMainThread or RunTestOnMainThread so that one or all tests can
 528   // enable/disable the accessibility audit.
 529   run_accessibility_checks_for_test_case_ = false;
 530
 531   SetUpOnMainThread();
 532 #if defined(OS_MACOSX)
 533   autorelease_pool_->Recycle();
 534 #endif
 535
 536   if (!HasFatalFailure())
 537     RunTestOnMainThread();
 538 #if defined(OS_MACOSX)
 539   autorelease_pool_->Recycle();
 540 #endif
 541
 542   if (run_accessibility_checks_for_test_case_) {
 543     std::string error_message;
 544     EXPECT_TRUE(RunAccessibilityChecks(&error_message));
 545     EXPECT_EQ("", error_message);
 546   }
 547
 548   // Invoke cleanup and quit even if there are failures. This is similar to
 549   // gtest in that it invokes TearDown even if Setup fails.
 550   TearDownOnMainThread();
 551 #if defined(OS_MACOSX)
 552   autorelease_pool_->Recycle();
 553 #endif
 554
 555   // Sometimes tests leave Quit tasks in the MessageLoop (for shame), so let's
 556   // run all pending messages here to avoid preempting the QuitBrowsers tasks.
 557   // TODO(jbates) Once crbug.com/134753 is fixed, this can be removed because it
 558   // will not be possible to post Quit tasks.
 559   content::RunAllPendingInMessageLoop();
 560
 561   QuitBrowsers();
 562   // All BrowserLists should be empty at this point.
 563   for (chrome::HostDesktopType t = chrome::HOST_DESKTOP_TYPE_FIRST;
 564        t < chrome::HOST_DESKTOP_TYPE_COUNT;
 565        t = static_cast<chrome::HostDesktopType>(t + 1)) {
 566     CHECK(BrowserList::GetInstance(t)->empty()) << t;
 567   }
 568 }
 569
 570 void InProcessBrowserTest::QuitBrowsers() {
 571   if (chrome::GetTotalBrowserCount() == 0) {
 572     chrome::NotifyAppTerminating();
 573     return;
 574   }
 575
 576   // Invoke AttemptExit on a running message loop.
 577   // AttemptExit exits the message loop after everything has been
 578   // shut down properly.
 579   base::MessageLoopForUI::current()->PostTask(FROM_HERE,
 580                                               base::Bind(&chrome::AttemptExit));
 581   content::RunMessageLoop();
 582
 583 #if defined(OS_MACOSX)
 584   // chrome::AttemptExit() will attempt to close all browsers by deleting
 585   // their tab contents. The last tab contents being removed triggers closing of
 586   // the browser window.
 587   //
 588   // On the Mac, this eventually reaches
 589   // -[BrowserWindowController windowWillClose:], which will post a deferred
 590   // -autorelease on itself to ultimately destroy the Browser object. The line
 591   // below is necessary to pump these pending messages to ensure all Browsers
 592   // get deleted.
 593   content::RunAllPendingInMessageLoop();
 594   delete autorelease_pool_;
 595   autorelease_pool_ = NULL;
 596 #endif
 597 }