The ruby community likes tests. And that's a good thing. But sometimes rubyists go a bit too far with this. Can there be too much testing? Is that considered harmful?
This presentation goes over the problems of "too much testing", and those of a natural consequence of having too many tests: irrelevant/bad tests. It then moves onwards to a few things I've picked up during the last few years that have helped me in keeping my test suites under control.