void QhullLinkedList_test::
t_element()
{
RboxPoints rcube("c");
Qhull q(rcube,"QR0"); // rotated unit cube
QhullVertexList vs = q.vertexList();
QhullVertex v= vs.first();
QCOMPARE(v.previous(), QhullVertex(NULL));
QCOMPARE(vs.front(), vs.first());
QhullVertex v2= vs.last();
QCOMPARE(v2.next().next(), QhullVertex(NULL)); // sentinel has NULL next
QCOMPARE(vs.back(), vs.last());
}//t_element
