public function testGetEdgesClones()
{
// 1 -> 2 -> 1
$graph = new Graph();
$v1 = $graph->createVertex(1);
$v2 = $graph->createVertex(2);
$e1 = $v1->createEdgeTo($v2);
$e2 = $v2->createEdgeTo($v1);
$graphClone = $graph->createGraphClone();
$this->assertEdgeEquals($e1, $graphClone->getEdgeClone($e1));
$this->assertEdgeEquals($e2, $graphClone->getEdgeCloneInverted($e1));
}