assertSame(null, iterator.prev(true));
assertSame(n2v2, iterator.next(true));
assertSame(null, iterator.next(true));
assertSame(n2v1, iterator.prevVariant(true));
assertSame(null, iterator.prevVariant(true));
assertSame(n1, iterator.prev(true));
assertSame(n2v1, iterator.next(true));
assertSame(n2v2, iterator.nextVariant(true));
assertSame(null, iterator.nextVariant(true));
}