@Test
    public void shouldBeUtilityClass() throws Exception {
        final Constructor constructor = Tokens.class.getDeclaredConstructor();
        assertTrue(Modifier.isFinal(Tokens.class.getModifiers()));
        assertTrue(Modifier.isPrivate(constructor.getModifiers()));
        constructor.setAccessible(true);
        constructor.newInstance();
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-driver/src/test/java/org/apache/tinkerpop/gremlin/driver/TokensTest.java