assertTrue(mark.containsNews(news1));
assertTrue(mark.containsNews(news2));
assertTrue(mark.containsNews(news3));
assertTrue(mark.containsNews(copiedNews1));
assertTrue(mark.containsNews(copiedNews2));
assertTrue(mark.containsNews(copiedNews3));
assertTrue(mark.containsNews(otherNews1));
}
{
assertTrue(mark.isRelatedTo(news1));