cache.addRelation(new Triple(e, closedP, f));
cache.addRelation(new Triple(f, closedP, d));
cache.addRelation(new Triple(b, closedP, d));
cache.addRelation(new Triple(f, closedP, c));
TestUtil.assertIteratorValues(this,
cache.find(new TriplePattern(a, directP, null)),
new Object[] {
new Triple(a, closedP, a),
new Triple(a, closedP, b),
new Triple(a, closedP, c),
new Triple(a, closedP, d),