public boolean isUserAllowed(UserGroupInformation ugi) {
    return isUserInList(ugi);
  }
@Test
  public void testIsUserAllowed() {
    AccessControlList acl;

    UserGroupInformation drwho =
        UserGroupInformation.createUserForTesting("drwho@EXAMPLE.COM",
            new String[] { "aliens", "humanoids", "timelord" });
    UserGroupInformation susan =
        UserGroupInformation.createUserForTesting("susan@EXAMPLE.COM",
            new String[] { "aliens", "humanoids", "timelord" });
    UserGroupInformation barbara =
        UserGroupInformation.createUserForTesting("barbara@EXAMPLE.COM",
            new String[] { "humans", "teachers" });
    UserGroupInformation ian =
        UserGroupInformation.createUserForTesting("ian@EXAMPLE.COM",
            new String[] { "humans", "teachers" });

    acl = new AccessControlList("drwho humanoids");
    assertUserAllowed(drwho, acl);
    assertUserAllowed(susan, acl);
    assertUserNotAllowed(barbara, acl);
    assertUserNotAllowed(ian, acl);

    acl = new AccessControlList("drwho");
    assertUserAllowed(drwho, acl);
    assertUserNotAllowed(susan, acl);
    assertUserNotAllowed(barbara, acl);
    assertUserNotAllowed(ian, acl);

    acl = new AccessControlList("drwho ");
    assertUserAllowed(drwho, acl);
    assertUserNotAllowed(susan, acl);
    assertUserNotAllowed(barbara, acl);
    assertUserNotAllowed(ian, acl);

    acl = new AccessControlList(" humanoids");
    assertUserAllowed(drwho, acl);
    assertUserAllowed(susan, acl);
    assertUserNotAllowed(barbara, acl);
    assertUserNotAllowed(ian, acl);

    acl = new AccessControlList("drwho,ian aliens,teachers");
    assertUserAllowed(drwho, acl);
    assertUserAllowed(susan, acl);
    assertUserAllowed(barbara, acl);
    assertUserAllowed(ian, acl);

    acl = new AccessControlList("");
    UserGroupInformation spyUser = spy(drwho);
    acl.isUserAllowed(spyUser);
    verify(spyUser, never()).getGroupNames();
  }