mariuszlusiak
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The reason why we did this is twofold. First of all it's a joke based on the type of humour known from Chuck's Testa ad (http://www.youtube.com/watch?feature=player_embedded&v=L..., chances are he didn't mean to be humorous). When your specs fail, the formatter at first tells you that they pass, just to reveal the truth a second later. This was meant as a joke so we didn't attach any screenshots on purpose, as you don't usually explain a joke before telling it. We now understand this put many people off, and we probably could have done better.
ChuckTestar is, however, something more than that. If you're a Ruby developer chances are that at some point you may find the ability to use custom RSpec formatters useful. What we show with the open source code is how to overwrite default formatter's behaviour, how to add Growl Notifications, how to make your machine tell you (i.e. speak out loud) whether your tests pass or fail. We solve the problem of supporting both OSX and Linux. That's a bunch of really useful things packed into this small gem.
There's also a related blog post that I wrote explaining all this in more detail: http://applicake.com/blog/index.php/2011/11/15/how-to-write-....