@Test
public void testGetNumericGroupsResolvable() throws Exception {

  TestNumericGroupResolvable mapping = new TestNumericGroupResolvable();
  List<String> groups = mapping.getGroups("user");
  assertTrue(groups.size() == 3);
  assertTrue(groups.contains("23"));
  assertTrue(groups.contains("groupname"));
  assertTrue(groups.contains("zzz"));
}