@Test
public void testRemoveGroupMembersInvalidInput() {

    List<GroupMember> list = Collections.singletonList(new GroupMember().setMemberName("member1"));
    AuthzHelper.removeGroupMembers(list, null);
    assertEquals(list.size(), 1);
    assertEquals(list.get(0).getMemberName(), "member1");
    AuthzHelper.removeGroupMembers(null, list);
    assertEquals(list.size(), 1);
    assertEquals(list.get(0).getMemberName(), "member1");
}