Test Data Management – What data? “Rubbish in = rubbish out” applies to many things in life, from diet to building and cooking, but especially to testing. It is all very well if you are doing negative testing, but most testing is about trying to prove things work the way they should, and that needs good test data. If you have an IBM i – or maybe you still call it AS/400 or iSeries – you have data, important data. TestBench gives you the tools to ensure that important data stays right and avoids errors leaking into production.