diff --git a/lib/redmine/menu_manager.rb b/lib/redmine/menu_manager.rb
index 25974ed83..9e35b15a5 100644
--- a/lib/redmine/menu_manager.rb
+++ b/lib/redmine/menu_manager.rb
@@ -221,6 +221,8 @@ module Redmine
     end
 
     class Mapper
+      attr_reader :menu, :menu_items
+
       def initialize(menu, items)
         items[menu] ||= MenuNode.new(:root, {})
         @menu = menu
diff --git a/test/unit/lib/redmine/menu_manager/mapper_test.rb b/test/unit/lib/redmine/menu_manager/mapper_test.rb
index ad6e04f3e..80d294254 100644
--- a/test/unit/lib/redmine/menu_manager/mapper_test.rb
+++ b/test/unit/lib/redmine/menu_manager/mapper_test.rb
@@ -19,7 +19,18 @@ require File.expand_path('../../../../../test_helper', __FILE__)
 
 class Redmine::MenuManager::MapperTest < ActiveSupport::TestCase
   context "Mapper#initialize" do
-    should "be tested"
+    should "define a root MenuNode if menu is not present in items" do
+      menu_mapper = Redmine::MenuManager::Mapper.new(:test_menu, {})
+      node = menu_mapper.menu_items
+      assert_not_nil node
+      assert_equal :root, node.name
+    end
+
+    should "use existing MenuNode if present" do
+      node = "foo" # just an arbitrary reference
+      menu_mapper = Redmine::MenuManager::Mapper.new(:test_menu, {:test_menu => node})
+      assert_equal node, menu_mapper.menu_items
+    end
   end
 
   def test_push_onto_root