@Test
lic void testFrom() {

    try
    {
        Set<Vertex<String>> froms = connect.from(a);
        assertTrue(froms.contains(c));
        assertTrue(froms.contains(b));
        froms = disConnect.from(a);
        assertTrue(!froms.contains(b));
        froms = connect.from(b);
        assertTrue(froms.contains(d));
    }
    catch (DirectedGraphException ex)
    {
        edu.ku.brc.af.core.UsageTracker.incrHandledUsageCount();
        edu.ku.brc.exceptions.ExceptionTracker.getInstance().capture(DirectedGraphTest.class, ex);
        //huh?
    }
}