@Test public void test() { Node root = new Node(5, null, null); IndexTree myTree = new IndexTree(root); myTree.addNode(new Node(4, null, null)); myTree.addNode(new Node(6, null, null)); Node elem = myTree.find(3); assertEquals(4, elem.getKey()); assertEquals(myTree.noOfElements, 3); assertEquals(elem.cost, 2); }