//6字形的环形
public void TestLinkListCycle_iscycle_six()
{
var head = BuildCycle_six();
var result = LinkListCycle.IsCycle(head);
Assert.AreEqual(result, true);
}
public void TestLinkListCycle_notcycle()
{
var head = MyLinkList.BuildListNodeFromArray(new[] { 1, 2, 3, 4, 5, 6, 7 });
var result = LinkListCycle.IsCycle(head);
Assert.AreEqual(result, false);
}