@Test(expected = ConcurrentModificationException.class)
  public void verify_newObjectAlreadySaved() throws Exception {
    // given
    Organization o = new Organization();
    o.setKey(1);
    Organization t = new Organization();
    t.setKey(0);

    // when
    VersionAndKeyValidator.verify(o, t, 0);
  }
  @Test
  public void verify() throws Exception {
    // given
    Organization o = new Organization();
    o.setKey(0);
    Organization t = new Organization();
    t.setKey(0);

    // when
    VersionAndKeyValidator.verify(o, t, 0);
  }
  @Test(expected = SaaSSystemException.class)
  public void verify_differentObjects() throws Exception {
    // given
    Organization o = new Organization();
    o.setKey(1);
    Organization t = new Organization();
    t.setKey(2);

    // when
    VersionAndKeyValidator.verify(o, t, 0);
  }
  @Test
  public void verify_wrongTemplateVersionInErrorMessage() throws Exception {
    // given
    Organization o = new Organization();
    o.setKey(1);
    Organization t = new Organization();
    t.setKey(0);

    // when
    try {
      VersionAndKeyValidator.verify(o, t, 1);
    } catch (ConcurrentModificationException e) {
      // then
      String versionInMessage =
          e.getMessage().substring(e.getMessage().length() - 1, e.getMessage().length());
      assertEquals("1", versionInMessage);
    }
  }