Created test for title replacement via window.history.replaceState().

ios/web/navigation/history_state_operations_inttest.mm

Index: ios/web/navigation/history_state_operations_inttest.mm
diff --git a/ios/web/navigation/history_state_operations_inttest.mm b/ios/web/navigation/history_state_operations_inttest.mm
index 9d01423902c93db8ddfc184fe73751b653e59541..2889de6453b4cc0239f8c47745597307617d9ffa 100644
--- a/ios/web/navigation/history_state_operations_inttest.mm
+++ b/ios/web/navigation/history_state_operations_inttest.mm
@@ -4,6 +4,7 @@
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/test/ios/wait_util.h"
 #import "ios/web/public/navigation_item.h"
 #import "ios/web/public/navigation_manager.h"
@@ -16,6 +17,8 @@
 #include "testing/gtest_mac.h"
 #include "url/url_canon.h"
 
+using base::ASCIIToUTF16;
+
 namespace {
 
 // URL for the test window.location test file.  The page at this URL contains
@@ -205,3 +208,33 @@ void WaitForNoOpText() {
   ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(), kReplaceStateId));
   WaitForNoOpText();
 }
+
+// Tests that calling window.history.replaceState() with only a new title
+// successfully replaces the current NavigationItem's title.
+// TODO(crbug.com/677356): Enable this test once the NavigationItem's title is
+// updated from within the web layer.
+TEST_F(HistoryStateOperationsTest, DISABLED_TitleReplacement) {
+  // Navigate to about:blank then navigate back to the test page.  The created
+  // NavigationItem can be used later to verify that the title is replaced
+  // rather than pushed.
+  GURL about_blank("about:blank");
+  LoadUrl(about_blank);
+  web::NavigationItem* about_blank_item = GetLastCommittedItem();
+  ExecuteBlockAndWaitForLoad(state_operations_url(), ^{
+    navigation_manager()->GoBack();
+  });
+  EXPECT_EQ(state_operations_url(), GetLastCommittedItem()->GetURL());
+  // Set up the state parameters and tap the replace state button.
+  std::string empty_state;
+  std::string new_title("NEW TITLE");
+  GURL empty_url;
+  SetStateParams(empty_state, new_title, empty_url);
+  ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(), kReplaceStateId));
+  // Wait for the title to be reflected in the NavigationItem.
+  base::test::ios::WaitUntilCondition(^bool {
+    return GetLastCommittedItem()->GetTitle() == ASCIIToUTF16(new_title);
+  });
+  // Verify that the forward navigation was not pruned.
+  EXPECT_EQ(GetIndexOfNavigationItem(GetLastCommittedItem()) + 1,
+            GetIndexOfNavigationItem(about_blank_item));
+}