On Saturday, 12 May 2018 at 07:07:33 UTC, Jonathan M Davis wrote:
You obviously don't have to test your private functions if you don't want to, but if you're trying to state that testing private functions is bad practice (and that's very much what it seemed like you were saying when you talked about testing private functions killing unicorns), [...]
Actually Jim Weirich (Rake's creator) at one of Ruby's conferences had a coffee mug with "Every time you test a private method, an unicorn dies".