@Test
public void testVerticesWithDirectionFactIsDestination() {

  UUID objectID = mockObjectWithFact(Direction.FactIsDestination);
  Vertex vertex = new ObjectVertex(getActGraph(), objectID);
  assertTrue(vertex.vertices(BOTH).hasNext());
  assertFalse(vertex.vertices(IN).hasNext());
  assertTrue(vertex.vertices(OUT).hasNext());
}