/**
* Test for to set check point and forget all previous state of state machine
*
* @return void
*/
public function testShouldBeAbleToSetCheckpointAndForgetAllPreviousStatesOfAMachine()
{
$stateMachine = new StateMachine();
$stateMachine->addState("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"1\" index=\"1\">First</item><item id=\"2\">Second</item></listofitems>");
$stateMachine->addState("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"2\">second</item><item id=\"3\">Third</item></listofitems>");
$stateMachine->addState("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"1\" index=\"1\">First</item><item id=\"2\">Second</item></listofitems>");
$stateMachine->addState("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"4\">Fourth</item></listofitems>");
$stateMachine->addState("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"2\">second</item><item id=\"3\">Third</item></listofitems>");
$this->assertXmlStringEqualsXmlString("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"2\">second</item><item id=\"3\">Third</item></listofitems>", $stateMachine->getCurrentState());
$stateMachine->checkPoint(2);
$this->assertXmlStringEqualsXmlString("<?xml version=\"1.0\" encoding=\"utf-8\"?><listofitems><item id=\"2\">second</item><item id=\"3\">Third</item></listofitems>", $stateMachine->getState($stateMachine->getFirstIndex()));
$stateMachine->checkPoint(4);
$this->assertXmlStringEqualsXmlString("<?xml version=\"1.0\" ?><listofitems><item id=\"4\">Fourth</item></listofitems>", $stateMachine->getState($stateMachine->getFirstIndex()));
}
