RandomTextDataGenerator(int size, int wordSize) {
    this(size, DEFAULT_SEED , wordSize);
  }
@Test
  public void testRandomTextDataGenerator() {
    RandomTextDataGenerator rtdg = new RandomTextDataGenerator(10, 0L, 5);
    List<String> words = rtdg.getRandomWords();

    // check the size
    assertEquals("List size mismatch", 10, words.size());

    // check the words
    Set<String> wordsSet = new HashSet<String>(words);
    assertEquals("List size mismatch due to duplicates", 10, wordsSet.size());

    // check the word lengths
    for (String word : wordsSet) {
      assertEquals("Word size mismatch", 5, word.length());
    }
  }