@Test
    public void shouldDetermineElementsAreNotEqualBecauseSecondArgumentIsNull() {
        Element v = mock(Element.class);
        assertFalse(ElementHelper.areEqual(v, null));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/util/ElementHelperTest.java