Created test for no-op history state operations.

ios/web/test/web_int_test.h

 // Copyright 2015 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.
 
 #ifndef IOS_WEB_TEST_WEB_INT_TEST_H_
 #define IOS_WEB_TEST_WEB_INT_TEST_H_
 
 #import <WebKit/WebKit.h>
 
 #import "base/ios/block_types.h"
@@ skipping 16 matching lines @@
   // WebTest methods.
   void SetUp() override;
   void TearDown() override;
 
   // The WebState and NavigationManager used by this test fixture.
   WebState* web_state() { return web_state_.get(); }
   NavigationManager* navigation_manager() {
     return web_state()->GetNavigationManager();
   }
 
+  // Returns the last committed NavigationItem in |navigation_manager|.
+  NavigationItem* GetLastCommittedItem() {
+    return navigation_manager()->GetLastCommittedItem();
+  }
+
   // Synchronously executes |script| on |web_state|'s JS injection receiver and
   // returns the result.
   id ExecuteJavaScript(NSString* script);
 
   // Executes |block| and waits until |url| is successfully loaded in
   // |web_state_|.
   void ExecuteBlockAndWaitForLoad(const GURL& url, ProceduralBlock block);
 
   // Navigates |web_state_| to |url| and waits for the page to be loaded.
   void LoadUrl(const GURL& url);
@@ skipping 11 matching lines @@
  private:
   // WebState used to load pages.
   std::unique_ptr<WebState> web_state_;
   // WebStateObserver used to wait for page loads.
   std::unique_ptr<IntTestWebStateObserver> observer_;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_TEST_WEB_INT_TEST_H_