public void ToJson_And_FromJson_Exports_And_Imports_Tree()
{
var tree = new RTree <int>(4);
tree.Load(_data);
string json = tree.ToJson();
var treeFromJson = new RTree <int>(4);
treeFromJson.FromJson(json);
CompareNodes(tree.All().ToArray(), treeFromJson.All().ToArray());
}