@Test
    @LoadGraphWith(MODERN)
    public void g_V_asXa_bX_out_asXcX_path_selectXkeysX() {
        final Traversal<Vertex, Collection<Set<String>>> traversal = get_g_V_asXa_bX_out_asXcX_path_selectXkeysX();
        int counter = 0;
        while (traversal.hasNext()) {
            final List<Set<String>> set = (List) traversal.next();
            assertTrue(set.get(0).contains("a"));
            assertTrue(set.get(0).contains("b"));
            assertEquals(2, set.get(0).size());
            assertTrue(set.get(1).contains("c"));
            assertEquals(1, set.get(1).size());
            counter++;
        }
        assertEquals(6, counter);
        assertFalse(traversal.hasNext());
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
@author Daniel Kuppitz (http://gremlin.guru)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/SelectTest.java