Created test for window.location.replace() with unresolvable URLs.

ios/web/navigation/window_location_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.
 
 #import "base/mac/bind_objc_block.h"
 #include "base/mac/foundation_util.h"
 #include "base/memory/ptr_util.h"
 #import "base/strings/sys_string_conversions.h"
 #include "base/test/ios/wait_util.h"
 #import "ios/web/public/navigation_item.h"
@@ skipping 151 matching lines @@
                                                    kWindowLocationReplaceID));
   });
 
   // Verify that |sample_url| was loaded and that |about_blank_item| was pruned.
   web::NavigationItem* current_item =
       navigation_manager()->GetLastCommittedItem();
   EXPECT_EQ(sample_url, current_item->GetURL());
   EXPECT_EQ(GetIndexOfNavigationItem(current_item) + 1,
             GetIndexOfNavigationItem(about_blank_item));
 }
+
+// Tests that calling window.location.replace() with an unresolvable URL loads
+// about:blank.
+TEST_F(WindowLocationTest, WindowLocationReplaceUnresolvable) {
+  // Attempt to call window.location.assign() using an unresolvable URL.
+  GURL about_blank("about:blank");
+  GURL unresolvable_url("http:https:not a url");
+  SetWindowLocationUrl(unresolvable_url);
+  ExecuteBlockAndWaitForLoad(about_blank, ^{
+    ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(),
+                                                   kWindowLocationReplaceID));
+  });
+
+  // Verify that about:blank was actually loaded.
+  EXPECT_EQ(about_blank,
+            navigation_manager()->GetLastCommittedItem()->GetURL());
+}