added failing test for Warden before_failure hooks

test/test_helpers_test.rb

@@ -81,6 +81,16 @@ class TestHelpersTest < ActionController::TestCase
       Warden::Manager._before_logout.pop
     end
   end
+  
+  test "before_failer call should work" do
+    Warden::Manager.before_failure do |env,opts|
+      # Do nothing
+    end
+    user = create_user
+    user.confirm!
+
+    sign_in user
+  end
 
   test "allows to sign in with different users" do
     first_user = create_user