public void InsertAFew()
 {
     var tree = new BinarySearchTree.BinarySearchTree<int>();
       tree.Add(-1);
       tree.Add(0);
       tree.Add(1);
       CollectionAssert.AreEquivalent(new int[] { -1, 0, 1 }, tree.ToList());
 }
 public void Insert_InitializationList()
 {
     var tree = new BinarySearchTree.BinarySearchTree<int>() { -1, 0, 1 };
       CollectionAssert.AreEquivalent(new int[] { -1, 0, 1 }, tree.ToList());
 }
 public void Insert()
 {
     var tree = new BinarySearchTree.BinarySearchTree<int>();
       tree.Insert(0);
       CollectionAssert.AreEqual(new int[] { 0 }, tree.ToList());
 }