Hspec is a testing framework for Haskell. It is inspired by the Ruby library RSpec. Some of Hspec's distinctive features are:
An example is worth a thousand words, so here we go:
cabal update && cabal install hspec
-- file Spec.hs
import Test.Hspec
import Test.QuickCheck
import Control.Exception (evaluate)
main :: IO ()
main = hspec $ do
describe "Prelude.head" $ do
it "returns the first element of a list" $ do
head [23 ..] `shouldBe` (23 :: Int)
it "returns the first element of an *arbitrary* list" $
property $ \x xs -> head (x:xs) == (x :: Int)
it "throws an exception if used with an empty list" $ do
evaluate (head []) `shouldThrow` anyExceptionrunhaskell Spec.hs Prelude.head returns the first element of a list returns the first element of an *arbitrary* list throws an exception if used with an empty list Finished in 0.0005 seconds 3 examples, 0 failures