This month I'll work in the central project of one of biggest italian bank. The architecture is fully J2EE with large use of EJB :-(
Since my group will touch very sensible part of code, my first one request to the customer was: "Where can I found your test cases and regression tests? I'd like to run their before and after our changes..."
The response was: "We don't have their, but we have planned to write someone..."
I hope to write first-shot-running-code to avoid to hear in the middle of the night the police to knock on my door... :-D