entry.removeAttributes( atCN, atSN );
assertFalse( entry.containsAttribute( "cn", "sn" ) );
assertTrue( entry.containsAttribute( "objectclass", "userpassword" ) );
List<EntryAttribute> removed = entry.removeAttributes( (AttributeType)null );
assertNull( removed );
removed = entry.removeAttributes( atC );
assertNull( removed );
}