@Test
    public void g_withSideEffectXk_nullX_injectXxX_selectXkX() {
        final Traversal<String, Object> traversal = get_g_withSideEffectXk_nullX_injectXxX_selectXkX();
        printTraversalForm(traversal);
        assertNull(traversal.next());
        assertThat(traversal.hasNext(), is(false));
    }
@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