             _sut = new Tree();
             _sut.width = 200;
             _sut.height = 200;
+
+            parent0 = {label: "Folder 0", children: new ArrayCollection()};
+            parent1 = {label: "Folder 1", children: new ArrayCollection([child])};
+
             UIImpersonator.addChild(_sut);
         }
 


        private static var _sut:Tree;
        private static var child:Object = {label: "Item"};
        private static var parent0:Object = {label: "Folder 0", children: new ArrayCollection()};
        private static var parent1:Object = {label: "Folder 1", children: new ArrayCollection([child])};


        [Before]

        //--------------------------------------------------------------------------

        [Test(async, timeout=1000)]
        public function test_closing_previously_opened_folder_with_0_children_without_animation_does_not_throw_fatal():void
        {
            //given
            const dataProvider:ArrayCollection = new ArrayCollection();
