haskell@gentoo.org Gentoo Haskell Chell is a simple and intuitive library for automated testing. It natively supports assertion-based testing, and can use companion libraries such as @chell-quickcheck@ to support more complex testing strategies. An example test suite, which verifies the behavior of artithmetic operators. @ {-\# LANGUAGE TemplateHaskell \#-} import Test.Chell tests_Math :: Suite tests_Math = suite \"math\"   test_Addition   test_Subtraction test_Addition :: Test test_Addition = assertions \"addition\" $ do   $expect (equal (2 + 1) 3)   $expect (equal (1 + 2) 3) test_Subtraction :: Test test_Subtraction = assertions \"subtraction\" $ do   $expect (equal (2 - 1) 1)   $expect (equal (1 - 2) (-1)) main :: IO () main = defaultMain [tests_Math] @ @ $ ghc --make chell-example.hs $ ./chell-example PASS: 2 tests run, 2 tests passed @ use colors in program output