QuickCheck was probably the thing that stuck the most when delving into Haskell. While, I don't use Haskell daily, using some kind QuickCheck derivative in whatever language I'm working in is something that has stuck.
It makes doing "TDD" much more appealing as you're not stuck thinking of the test cases all the time. You run it long enough, add any counter example it finds to your test suite.
It makes doing "TDD" much more appealing as you're not stuck thinking of the test cases all the time. You run it long enough, add any counter example it finds to your test suite.