public void EqualsAndHashCodeTest()
{
var te_a1 = new TreeElement<string, string>("a");
var te_a2 = new TreeElement<string, string>("a");
var te_b = new TreeElement<string, string>("b");
var te_node = new TreeElement<string, string>();
te_a1.Is(te_a1);
te_a1.GetHashCode().Is(te_a1.GetHashCode());
te_a1.Is(te_a2);
te_a1.GetHashCode().Is(te_a2.GetHashCode());
te_a1.IsNot(te_b);
te_a1.IsNot(te_node);
}