Yes. How much varies though. There are certain classes of test that take time in a dynamic language that you just don't have to write. They're unimportant 'just

Yes. How much varies though. There are certain classes of test that take time in a dynamic language that you just don't have to write. They're unimportant 'just check I'm actually passing a list to this function and not a class' type tests rather than interesting algorithmic or behavioural tests.