@Test
    public void shouldDetermineVerticesAreNotEqual() {
        final Element mockVertexA = mock(Vertex.class);
        final Element mockVertexB = mock(Vertex.class);
        when(mockVertexA.id()).thenReturn("1");
        when(mockVertexB.id()).thenReturn("2");
        assertFalse(ElementHelper.areEqual(mockVertexA, mockVertexB));
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/structure/util/ElementHelperTest.java