Created test verifying no hashchange event for replaceState() calls.

ios/web/navigation/history_state_operations_inttest.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.
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/test/ios/wait_util.h"
 #import "ios/web/navigation/navigation_item_impl.h"
@@ skipping 374 matching lines @@
   GURL new_url = state_operations_url().Resolve("path");
   SetStateParams(new_state, empty_title, new_url);
   ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(), kReplaceStateId));
   // Verify that url has been replaced.
   base::test::ios::WaitUntilCondition(^bool {
     return GetLastCommittedItem()->GetURL() == new_url;
   });
   // Verify that the NavigationItem no longer has POST data.
   EXPECT_FALSE(GetLastCommittedItem()->HasPostData());
 }
+
+// Tests that performing a replaceState() on a page where only the URL fragment
+// is updated does not trigger a hashchange event.
+TEST_F(HistoryStateOperationsTest, ReplaceStateNoHashChangeEvent) {
+  // Set up the state parameters and tap the replace state button.
+  std::string empty_state;
+  std::string empty_title;
+  GURL new_url = state_operations_url().Resolve("#hash");
+  SetStateParams(empty_state, empty_title, new_url);
+  ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(), kReplaceStateId));
+  // Verify that url has been replaced.
+  base::test::ios::WaitUntilCondition(^bool {
+    return GetLastCommittedItem()->GetURL() == new_url;
+  });
+  // Verify that the hashchange event was not fired.
+  EXPECT_FALSE(static_cast<web::NavigationItemImpl*>(GetLastCommittedItem())
+                   ->IsCreatedFromHashChange());
+}