Adds unit test: correct sub-menu-less menu item event behavior

Ensure open sub-menus close on sub-menu-less `click`
or `mouseenter` events.  See 9f53e0.

Author: Steven G. Harms

tests/unit/menubar/menubar_events.js

@@ -27,4 +27,25 @@ test( "handle click on menu item", function() {
 	equal( logOutput(), "click,(1,2),afterclick,(2,1),(3,3),(1,2)", "Click order not valid." );
 });
 
+test( "hover over a menu item with no sub-menu should close open menu", function() {
+  expect( 2 );
+
+	var element = $( "#bar1" ).menubar();
+  var links = $("#bar1 > li a");
+
+  var menuItemWithDropdown    = links.eq(1);
+  var menuItemWithoutDropdown = links.eq(0);
+
+  menuItemWithDropdown.trigger('click', {});
+  menuItemWithoutDropdown.trigger('mouseenter', {});
+
+  equal( $(".ui-menu:visible").length, 0 );
+
+  menuItemWithDropdown.trigger('click', {});
+  menuItemWithoutDropdown.trigger('click', {});
+
+  equal( $(".ui-menu:visible").length, 0 );
+
+});
+
 })( jQuery );

ui/jquery.ui.menubar.js

@@ -138,11 +138,11 @@ $.widget( "ui.menubar", {
 				}
 			} else {
 				// TODO use _on
-				input.bind( "click.menubar mouseenter.menubar", function( event ) {
-					if ( ( that.open && event.type === "mouseenter" ) || event.type === "click" ) {
-						that._close();
-					}
-				});
+        input.bind( "click mouseenter", function( event ) {
+          if ( ( that.open && event.type === "mouseenter" ) || event.type === "click" ) {
+            that._close();
+          }
+        });
 			}
 
 			input