public void TestInsertChild()
{
_tree.InsertAsRoot(0);
var lc = _tree.InsertAsLc(_tree.Root, 1);
var rc = _tree.InsertAsRc(_tree.Root, 2);
Assert.AreEqual(lc.Data, 1);
Assert.AreEqual(rc.Data, 2);
Assert.AreEqual(_tree.Size, 3);
}