@Test (timeout = 30000)
public void testTokenIdentifiers() throws Exception {
UserGroupInformation ugi = UserGroupInformation.createUserForTesting(
"TheDoctor", new String[] { "TheTARDIS" });
TokenIdentifier t1 = mock(TokenIdentifier.class);
TokenIdentifier t2 = mock(TokenIdentifier.class);
ugi.addTokenIdentifier(t1);
ugi.addTokenIdentifier(t2);
Collection<TokenIdentifier> z = ugi.getTokenIdentifiers();