public function testGetIntersectingNode()
{
$n1 = new Node("one");
$n2 = new Node("two");
$n3 = new Node("three");
$n4 = new Node("four");
$n5 = new Node("five");
$n1->setNext($n2);
$n2->setNext($n3);
$n3->setNext($n4);
$n4->setNext($n5);
$this->assertNull(LinkedListCycleDetector::getCycleNode($n1));
// create a cycle
$n5->setNext($n3);
$this->assertSame($n3, LinkedListCycleDetector::getCycleNode($n1));
}
public function testFindBeginningOfCycleWithCircularListOfSizeFive()
{
$n1 = new Node("one");
$n2 = new Node("two");
$n3 = new Node("three");
$n4 = new Node("four");
$n5 = new Node("five");
$n1->setNext($n2);
$n2->setNext($n3);
$n3->setNext($n4);
$n4->setNext($n5);
$n5->setNext($n1);
$cycleNode = LinkedListCycleDetector::findBeginningOfCycle($n1);
$this->assertSame($n1, $cycleNode, 'Expected: ' . $n1->getData() . ' Found: ' . $cycleNode->getData());
}