Open just folder menu on middle clicking chevron button.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm

 // Copyright (c) 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/string16.h"
@@ skipping 921 matching lines @@
   EXPECT_TRUE([cell title]);
 
   // cell is autoreleased; no need to release here
 }
 
 // Test drawing, mostly to ensure nothing leaks or crashes.
 TEST_F(BookmarkBarControllerTest, Display) {
   [[bar_ view] display];
 }
 
-// Test that middle clicking on a bookmark button results in an open action.
+// Test that middle clicking on a bookmark button results in an open action,
+// except for offTheSideButton, as it just opens its folder menu.
 TEST_F(BookmarkBarControllerTest, MiddleClick) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
   GURL gurl1("http://www.google.com/");
   base::string16 title1(ASCIIToUTF16("x"));
   bookmarks::AddIfNotBookmarked(model, gurl1, title1);
 
   EXPECT_EQ(1U, [[bar_ buttons] count]);
   NSButton* first = [[bar_ buttons] objectAtIndex:0];
   EXPECT_TRUE(first);
 
   [first otherMouseUp:
       cocoa_test_event_utils::MouseEventWithType(NSOtherMouseUp, 0)];
   EXPECT_EQ(noOpenBar()->urls_.size(), 1U);
+
+  // Test for offTheSideButton.
+  // Add more bookmarks so that offTheSideButton is visible.
+  const BookmarkNode* parent = model->bookmark_bar_node();
+  for (int i = 0; i < 20; i++) {
+    model->AddURL(parent, parent->child_count(),
+                  ASCIIToUTF16("super duper wide title"),
+                  GURL("http://superfriends.hall-of-justice.edu"));
+  }
+  EXPECT_FALSE([bar_ offTheSideButtonIsHidden]);
+
+  NSButton* offTheSideButton = [bar_ offTheSideButton];
+  EXPECT_TRUE(offTheSideButton);
+  [offTheSideButton otherMouseUp:
+      cocoa_test_event_utils::MouseEventWithType(NSOtherMouseUp, 0)];
+
+  // Middle click on offTheSideButton should not open any bookmarks under it,
+  // therefore urls size should still be 1.
+  EXPECT_EQ(noOpenBar()->urls_.size(), 1U);
+
+  // Check that folderController should not be NULL since offTheSideButton
+  // folder is currently open.
+  BookmarkBarFolderController* bbfc = [bar_ folderController];
+  EXPECT_TRUE(bbfc);
+  EXPECT_TRUE([bbfc parentButton] == offTheSideButton);
+
+  // Middle clicking again on it should close the folder.
+  [offTheSideButton otherMouseUp:
+      cocoa_test_event_utils::MouseEventWithType(NSOtherMouseUp, 0)];
+  bbfc = [bar_ folderController];
+  EXPECT_FALSE(bbfc);
 }
 
 TEST_F(BookmarkBarControllerTest, DisplaysHelpMessageOnEmpty) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
   [bar_ loaded:model];
   EXPECT_FALSE([[[bar_ buttonView] noItemContainer] isHidden]);
 }
 
 TEST_F(BookmarkBarControllerTest, HidesHelpMessageWithBookmark) {
   BookmarkModel* model = BookmarkModelFactory::GetForProfile(profile());
@@ skipping 1131 matching lines @@
                              "2f3b ] 4b ");
   actual = test::ModelStringFromNode(root);
   EXPECT_EQ(expected, actual);
 
   // Verify that the other bookmark folder can't be deleted.
   BookmarkButton *otherButton = [bar_ otherBookmarksButton];
   EXPECT_FALSE([bar_ canDragBookmarkButtonToTrash:otherButton]);
 }
 
 }  // namespace