void QhullLinkedList_test::
t_search()
{
    RboxPoints rcube("c");
    Qhull q(rcube,"QR0");  // rotated unit cube
    QhullVertexList vs = q.vertexList();
    QhullVertex v;
    QVERIFY(!vs.contains(v));
    QCOMPARE(vs.count(v), 0);
    QhullVertex v2= *vs.begin();
    QhullVertex v3= vs.last();
    QVERIFY(vs.contains(v2));
    QCOMPARE(vs.count(v2), 1);
    QVERIFY(vs.contains(v3));
    QCOMPARE(vs.count(v3), 1);
}//t_search