@Test
  public void exists() {
    boolean bool;
    String path;
    try {
      path = "file:/home/lambert/test/prod0";
      bool = dao.exists(new URL(path));
      Assert.assertTrue(bool, "product with path '" + path + "' should be" + "exists");

      path = "file:/home/lambert/test/product999";
      bool = dao.exists(new URL(path));
      Assert.assertFalse(bool, "product with path '" + path + "' should be npt exists");
    } catch (MalformedURLException e) {
      Assert.fail("Error: malformed URL", e);
    }
  }