Created test for window.location.assign() 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 103 matching lines @@
   ExecuteBlockAndWaitForLoad(sample_url, ^{
     ASSERT_TRUE(web::test::TapWebViewElementWithId(web_state(),
                                                    kWindowLocationAssignID));
   });
 
   // Verify that |sample_url| was loaded and that |about_blank_item| was pruned.
   EXPECT_EQ(sample_url, navigation_manager()->GetLastCommittedItem()->GetURL());
   EXPECT_EQ(NSNotFound, GetIndexOfNavigationItem(about_blank_item));
 }
 
+// Tests that calling window.location.assign() with an unresolvable URL loads
+// about:blank.
+TEST_F(WindowLocationTest, WindowLocationAssignUnresolvable) {
+  // 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(),
+                                                   kWindowLocationAssignID));
+  });
+
+  // Verify that about:blank was actually loaded.
+  EXPECT_EQ(about_blank,
+            navigation_manager()->GetLastCommittedItem()->GetURL());
+}
+
 // Tests that calling window.location.replace() doesn't create a new
 // NavigationItem.
 // TODO(crbug.com/307072): Enable test when location.replace is fixed.
 TEST_F(WindowLocationTest, DISABLED_Replace) {
   // Navigate to about:blank so there is a forward entry.
   GURL about_blank("about:blank");
   LoadUrl(about_blank);
   web::NavigationItem* about_blank_item =
       navigation_manager()->GetLastCommittedItem();
 
@@ skipping 11 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));
 }