assertTrue(news.contains(copiedNews2.toReference()));
assertTrue(news.contains(othernews1.toReference()));
}
{
assertTrue(mark.containsNews(news1));
assertTrue(mark.containsNews(news2));
assertTrue(mark.containsNews(news3));
assertTrue(mark.containsNews(copiedNews1));
assertTrue(mark.containsNews(copiedNews2));
assertTrue(mark.containsNews(copiedNews3));