public AccessControlList() {
  }
@Test
  public void testAccessControlList() throws Exception {
    AccessControlList acl;
    Collection<String> users;
    Collection<String> groups;
    
    acl = new AccessControlList("drwho tardis");
    users = acl.getUsers();
    assertThat(users.size()).isOne();
    assertThat(users.iterator().next()).isEqualTo("drwho");
    groups = acl.getGroups();
    assertThat(groups.size()).isOne();
    assertThat(groups.iterator().next()).isEqualTo("tardis");
    
    acl = new AccessControlList("drwho");
    users = acl.getUsers();
    assertThat(users.size()).isOne();
    assertThat(users.iterator().next()).isEqualTo("drwho");
    groups = acl.getGroups();
    assertThat(groups.size()).isZero();
    
    acl = new AccessControlList("drwho ");
    users = acl.getUsers();
    assertThat(users.size()).isOne();
    assertThat(users.iterator().next()).isEqualTo("drwho");
    groups = acl.getGroups();
    assertThat(groups.size()).isZero();
    
    acl = new AccessControlList(" tardis");
    users = acl.getUsers();
    assertThat(users.size()).isZero();
    groups = acl.getGroups();
    assertThat(groups.size()).isOne();
    assertThat(groups.iterator().next()).isEqualTo("tardis");

    Iterator<String> iter;    
    acl = new AccessControlList("drwho,joe tardis, users");
    users = acl.getUsers();
    assertThat(users.size()).isEqualTo(2);
    iter = users.iterator();
    assertThat(iter.next()).isEqualTo("drwho");
    assertThat(iter.next()).isEqualTo("joe");
    groups = acl.getGroups();
    assertThat(groups.size()).isEqualTo(2);
    iter = groups.iterator();
    assertThat(iter.next()).isEqualTo("tardis");
    assertThat(iter.next()).isEqualTo("users");
  }