A whole day is a little excessive but other wise that's exactly what an interview should be. I'd like nothing better than to see the actual code I'd be working

A whole day is a little excessive but other wise that's exactly what an interview should be. I'd like nothing better than to see the actual code I'd be working with and see how I work together with others on the team. In fact I once passed on a job offer because they wouldn't let me see the code until I accepted.