Multi-tab: Adding new Notification when tab selection changes (again).

chrome/browser/tabs/tab_strip_selection_model_unittest.cc

 // Copyright (c) 2011 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 <algorithm>
 #include <string>
 
 #include "base/string_number_conversions.h"
 #include "chrome/browser/tabs/tab_strip_selection_model.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 155 matching lines @@
 TEST_F(TabStripSelectionModelTest, AddSelectionFromAnchorTo) {
   TabStripSelectionModel model;
   model.SetSelectedIndex(2);
 
   model.AddSelectionFromAnchorTo(4);
   EXPECT_EQ("active=4 anchor=2 selection=2 3 4", StateAsString(model));
 
   model.AddSelectionFromAnchorTo(0);
   EXPECT_EQ("active=0 anchor=2 selection=0 1 2 3 4", StateAsString(model));
 }
+
+TEST_F(TabStripSelectionModelTest, Equals) {
+  TabStripSelectionModel model1;
+  model1.SetSelectedIndex(0);
+  model1.AddSelectionFromAnchorTo(4);
+
+  TabStripSelectionModel model2;
+  model2.SetSelectedIndex(0);
+  model2.AddSelectionFromAnchorTo(4);
+
+  EXPECT_TRUE(model1.Equals(model2));
+  EXPECT_TRUE(model2.Equals(model1));
+
+  model2.SetSelectedIndex(0);
+  EXPECT_FALSE(model1.Equals(model2));
+  EXPECT_FALSE(model2.Equals(model1));
+}