public void testUnidirectionalCollection() throws Exception {
final Session session = openSession();
Transaction transaction = session.beginTransaction();
SnowFlake sf = new SnowFlake();
sf.setDescription( "Snowflake 1" );
session.save( sf );
SnowFlake sf2 = new SnowFlake();
sf2.setDescription( "Snowflake 2" );
session.save( sf2 );
Cloud cloud = new Cloud();
cloud.setLength( 23 );