@Test
  public void testWrongHTML() {
    String html = "<html></html>";
    Document doc = Jsoup.parse(html);

    OnetArticleParser articleParser = new OnetArticleParser();
    IArticle article = articleParser.parseDocument(doc);

    assertNull(article);
  }
 @Test
 public void testNullDocuments() {
   OnetArticleParser articleParser = new OnetArticleParser();
   IArticle article = articleParser.parseDocument(null);
   assertNull(article);
 }
 private IArticle getExampleDoc() {
   Document doc = getExampleDocument();
   OnetArticleParser articleParser = new OnetArticleParser();
   IArticle article = articleParser.parseDocument(doc);
   return article;
 }