@Test
    @LoadGraphWith(MODERN)
    public void g_V_properties_hasKeyXnull_ageX_value() {
        final Traversal<Vertex, Integer> traversal = get_g_V_properties_hasKeyXnull_ageX_value();
        printTraversalForm(traversal);
        checkResults(Arrays.asList(27, 29, 32, 35), traversal);
        assertThat(traversal.hasNext(), is(false));
    }
@author Marko A. Rodriguez (http://markorodriguez.com)
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/filter/HasTest.java