@Test
  public void testCreateAndAddUserRoles() {
    DataSourceAclModel model = new DataSourceAclModel();
    assertNull(model.getRoles());
    assertNull(model.getUsers());
    model.addRole("testRole");
    model.addUser("testUser");
    assertEquals("testRole", model.getRoles().get(0));
    assertEquals("testUser", model.getUsers().get(0));

    model.setUsers(Arrays.asList("otherTestUser"));
    model.setRoles(Arrays.asList("otherTestRole"));

    assertEquals("otherTestRole", model.getRoles().get(0));
    assertEquals("otherTestUser", model.getUsers().get(0));
  }