public void getMostFrequentWords() throws UnsupportedEncodingException {
        String stopwords = "this\nbla";
        String reviews = "1 bad movie\n2 average movie\n3 average performance\n2 bad";
        InputStream stopwordsStream = new ByteArrayInputStream(stopwords.getBytes("UTF-8"));
        InputStream reviewsStream = new ByteArrayInputStream(reviews.getBytes("UTF-8"));
        OutputStream output = new ByteArrayOutputStream();
        MovieReviewSentimentAnalyzer ma = new MovieReviewSentimentAnalyzer(stopwordsStream, reviewsStream, output);
        ArrayList<String> wordsSorted = new ArrayList<>();
        wordsSorted.add("average");
        Collection<String> res = ma.getMostFrequentWords(1);
        assertEquals(wordsSorted, ma.getMostFrequentWords(1));
    }