@Test(expected = IllegalArgumentException.class)
    public void shouldFailCauseEmptyLabelsAreNotAllowed() {
        ElementHelper.getLabelValue("test", 321, T.label, "", "testagain", "that");
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/util/ElementHelperTest.java