@Test(expected = FastNoSuchElementException.class)
    public void shouldThrowFastNoSuchElementException() {
        final Iterator<String> itty = new DoubleIterator<>("test1", "test2");
        itty.next();
        itty.next();
        itty.next();
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/util/iterator/DoubleIteratorTest.java