Quick & dirty example of a WebUIBrowserTest using LoginManagerTestHelper.

chrome/browser/chromeos/login/login_manager_test.h

Index: chrome/browser/chromeos/login/login_manager_test.h
diff --git a/chrome/browser/chromeos/login/login_manager_test.h b/chrome/browser/chromeos/login/login_manager_test.h
index c080189c21f51c0d238ec6e81076d8cce8f27f72..66c7a995876f55ff52f7ab95bddd2aafdd317cd2 100644
--- a/chrome/browser/chromeos/login/login_manager_test.h
+++ b/chrome/browser/chromeos/login/login_manager_test.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/login/login_manager_test_helper.h"
 #include "chrome/browser/chromeos/login/mock_login_utils.h"
 #include "chrome/browser/chromeos/login/test/js_checker.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ -19,13 +21,14 @@ namespace chromeos {
 
 // Base class for Chrome OS out-of-box/login WebUI tests.
 // If no special configuration is done launches out-of-box WebUI.
-// To launch login UI use PRE_* test that will register user(s) and mark
+// To launch login UI use a PRE_* test that will register user(s) and mark
 // out-of-box as completed.
-// Guarantees that WebUI has been initialized by waiting for
-// NOTIFICATION_LOGIN_OR_LOCK_WEBUI_VISIBLE notification.
+// Uses LoginManagerTestHelper to set up login utils and ensure WebUI has been
+// initialized.
 class LoginManagerTest : public InProcessBrowserTest {
  public:
   explicit LoginManagerTest(bool should_launch_browser);
+  virtual ~LoginManagerTest();
 
   // Overriden from InProcessBrowserTest.
   virtual void CleanUpOnMainThread() OVERRIDE;
@@ -38,31 +41,32 @@ class LoginManagerTest : public InProcessBrowserTest {
   // TODO(dzhioev): add ability to register users without PRE_* test.
   void RegisterUser(const std::string& username);
 
-  // Set expected credentials for next login attempt.
+  // Sets expected credentials for next login attempt.
   void SetExpectedCredentials(const std::string& username,
                               const std::string& password);
 
-  // Tries to login with |username| and |password|. Returns false if attempt
+  // Tries to log in with |username| and |password|. Returns false if attempt
   // has failed.
   bool TryToLogin(const std::string& username, const std::string& password);
 
   // Tries to add user to session with |username| and |password|. Returns false
-  // if attempt has failed. this function does the same as TryToLogin but
-  // doesn't check that new user become active user.
+  // if attempt has failed. This function does the same as TryToLogin but
+  // doesn't check that the new user became the active user.
   bool AddUserToSession(const std::string& username,
                         const std::string& password);
 
-  // Login user with |username|. User should be registered using RegisterUser().
+  // Logs in user with |username|. User should be registered using
+  // RegisterUser().
   void LoginUser(const std::string& username);
 
-  // Add user with |username| to session.
+  // Adds user with |username| to session.
   void AddUser(const std::string& username);
 
   // Executes given JS |expression| in |web_contents_| and checks
   // that it is true.
   void JSExpect(const std::string& expression);
 
-  MockLoginUtils& login_utils() { return *mock_login_utils_; }
+  MockLoginUtils& login_utils();
 
   content::WebContents* web_contents() { return web_contents_; }
 
@@ -74,6 +78,7 @@ class LoginManagerTest : public InProcessBrowserTest {
   }
 
   MockLoginUtils* mock_login_utils_;
+  scoped_ptr<LoginManagerTestHelper> login_manager_test_helper_;
   bool should_launch_browser_;
   content::WebContents* web_contents_;
   test::JSChecker js_checker_;