Was a .NET programmer a year ago. Tests regularly took more than several seconds to run, so it wasn't feasible - the feedback loop was too high. I'm a web deve

Was a .NET programmer a year ago. Tests regularly took more than several seconds to run, so it wasn't feasible - the feedback loop was too high. I'm a web developer now (Ruby on Rails), and I rarely do TDD. The feedback loop is quicker, but I still end up not doing it, and feel guilty for it.