@Test(expected = FastNoSuchElementException.class)
    public void shouldThrowFastNoSuchElementExceptionIfEmptyIteratorsAreAdded() {
        final AbortiveMultiIterator<String> itty = new AbortiveMultiIterator<>();
        itty.addIterator(EmptyIterator.instance());
        itty.addIterator(EmptyIterator.instance());
        itty.addIterator(EmptyIterator.instance());
        itty.addIterator(EmptyIterator.instance());
        itty.next();
    }
@author Stephen Mallette (http://stephen.genoprime.com)
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/util/iterator/AbortiveMultiIteratorTest.java