Upstream Chrome on iOS source code [1/11].

ios/chrome/app/main_application_delegate_unittest.mm

+// Copyright 2012 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.
+
+#include "ios/chrome/app/main_application_delegate.h"
+
+#import <Foundation/Foundation.h>
+
+#import "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsobject.h"
+#import "ios/chrome/app/chrome_overlay_window_testing.h"
+#include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
+#include "testing/platform_test.h"
+#import "third_party/ocmock/OCMock/OCMock.h"
+
+// Tests that the application does not crash if |applicationDidEnterBackground|
+// is called when the application is launched in background.
+// http://crbug.com/437307
+TEST(MainApplicationDelegateTest, CrashIfNotInitialized) {
+  // Save both ChromeBrowserProvider as MainController register new instance.
+  ios::ChromeBrowserProvider* stashed_chrome_browser_provider =
+      ios::GetChromeBrowserProvider();
+
+  id application = [OCMockObject niceMockForClass:[UIApplication class]];
+  UIApplicationState backgroundState = UIApplicationStateBackground;
+  [[[application stub] andReturnValue:OCMOCK_VALUE(backgroundState)]
+      applicationState];
+
+  MainApplicationDelegate* delegate =
+      [[[MainApplicationDelegate alloc] init] autorelease];
+  [delegate application:application didFinishLaunchingWithOptions:nil];
+  [delegate applicationDidEnterBackground:application];
+
+  // Clean up the size class recorder, which is created by the main window via
+  // a previous call to |application:didFinishLaunchingWithOptions:|, to prevent
+  // it from interfering with subsequent tests.
+  ChromeOverlayWindow* mainWindow =
+      base::mac::ObjCCastStrict<ChromeOverlayWindow>([delegate window]);
+  [mainWindow unsetSizeClassRecorder];
+
+  // Restore both ChromeBrowserProvider to its original value and destroy
+  // instances created by MainController.
+  DCHECK_NE(ios::GetChromeBrowserProvider(), stashed_chrome_browser_provider);
+  delete ios::GetChromeBrowserProvider();
+  ios::SetChromeBrowserProvider(stashed_chrome_browser_provider);
+}