         super.tearDown()
     }
     func testLinkedList() {
-         let list  = LinkedList.init()
-         list.swapNeiber()
+        let list  = LinkedList.init()
+        list.swapNeiber()
         list.appendArrayToTail(array:[1,2,3,4,5,6])
 //        removeLinkedListElements(list:list, target: 6)
         list.swapNeiber()

        tree.preOrderRecursive(tree.root!)
        print("start")
        tree.preOrderNoneRecursive(tree.root!)
 print("end")

        
        
    }
    
    func testPostRecursive() {

        if(list.appendToHead(1))
        {
            XCTAssertEqual(list.query(0), 1)
        }else
        {
            XCTAssertEqual(list.getSize(),0)
        }
    }
    func testPreRecursive() {
