@Test
  public void testGetAverageAge2() {
    System.out.println("getAverageAge");

    dvdLibraryDao.create(dvd1);
    dvdLibraryDao.create(dvd2);

    double result = Math.floor(dvdLibraryDao.getAverageAge());
    double expResult = dvd1.getReleaseDate().toInstant().getEpochSecond();
    expResult += dvd2.getReleaseDate().toInstant().getEpochSecond();
    expResult /= 2;
    expResult = new Date().toInstant().getEpochSecond() - expResult;
    expResult /= (3600 * 24);
    expResult = Math.floor(expResult);

    Assert.assertEquals(expResult, result, 0);
  }