Upstream Chrome on iOS source code [5/11].

ios/chrome/browser/ui/main/browser_view_wrangler_unittest.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 "ios/chrome/browser/ui/main/browser_view_wrangler.h"
+
+#include <UIKit/UIKit.h>
+
+#include "base/mac/scoped_nsobject.h"
+#include "components/bookmarks/test/bookmark_test_helpers.h"
+#include "ios/chrome/browser/bookmarks/bookmark_model_factory.h"
+#include "ios/chrome/browser/browser_state/test_chrome_browser_state.h"
+#import "ios/chrome/browser/tabs/tab_model.h"
+#import "ios/chrome/browser/ui/browser_view_controller.h"
+#include "ios/web/public/test/test_web_thread_bundle.h"
+#include "testing/platform_test.h"
+
+namespace {
+
+class BrowserViewWranglerTest : public PlatformTest {
+ protected:
+  BrowserViewWranglerTest() {
+    TestChromeBrowserState::Builder test_cbs_builder;
+    chrome_browser_state_ = test_cbs_builder.Build();
+    chrome_browser_state_->CreateBookmarkModel(false);
+    bookmarks::BookmarkModel* bookmark_model =
+        ios::BookmarkModelFactory::GetForBrowserState(
+            chrome_browser_state_.get());
+    bookmarks::test::WaitForBookmarkModelToLoad(bookmark_model);
+  }
+
+  // SessionWindow, used to create the TabModel, needs to run on the web thread.
+  web::TestWebThreadBundle thread_bundle_;
+  std::unique_ptr<TestChromeBrowserState> chrome_browser_state_;
+};
+
+TEST_F(BrowserViewWranglerTest, TestInitNilObserver) {
+  base::scoped_nsobject<BrowserViewWrangler> wrangler(
+      [[BrowserViewWrangler alloc]
+          initWithBrowserState:chrome_browser_state_.get()
+              tabModelObserver:nil]);
+
+  // Test that BVC and tab model are created on demand.
+  BrowserViewController* bvc = [wrangler mainBVC];
+  EXPECT_NE(bvc, nil);
+
+  TabModel* tabModel = [wrangler mainTabModel];
+  EXPECT_NE(tabModel, nil);
+
+  // Test that once created the BVC and tab model aren't re-created.
+  EXPECT_EQ(bvc, [wrangler mainBVC]);
+  EXPECT_EQ(tabModel, [wrangler mainTabModel]);
+
+  // Test that the OTR objects are (a) OTR and (b) not the same as the non-OTR
+  // objects.
+  EXPECT_NE(bvc, [wrangler otrBVC]);
+  EXPECT_NE(tabModel, [wrangler otrTabModel]);
+  EXPECT_TRUE([wrangler otrTabModel].browserState->IsOffTheRecord());
+}
+
+}  // namespace