Popularity
5.5
Declining
Activity
0.0
Stable
9
3
3
Monthly Downloads: 10
Programming language: Haskell
License: MIT License
Tags:
Testing
QuickCheck
Latest version: v0.2.0
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README
quickcheck-io: Use HUnit assertions as QuickCheck properties
This package provides an orphan instance that allows you to use HUnit assertions as QuickCheck properties.
Why would you want to do this?
Convenient testing of IO actions
Example: Setting an environment variable with setEnv
and then getting the
value back with getEnv
should work for arbitrary key–value pairs. Sounds
like a job for QuickCheck, huh?
import Test.QuickCheck
import Test.QuickCheck.IO ()
import Test.Hspec.Expectations (shouldReturn)
import System.SetEnv (setEnv)
import System.Environment (getEnv)
prop_setEnv k v = validKey k && validValue v ==> do
setEnv k v
getEnv k `shouldReturn` v
validKey k = (not . null) k && '\NUL' `notElem` k && '=' `notElem` k
validValue v = (not . null) v && '\NUL' `notElem` v
ghci> quickCheck prop_setEnv
+++ OK, passed 100 tests.
Better error messages for failing QuickCheck properties
You can e.g. use HUnit's @?=
ghci> import Test.QuickCheck
ghci> import Test.QuickCheck.IO
ghci> import Test.HUnit
ghci> quickCheck $ \x -> x + 23 @?= 23
*** Failed! (after 3 tests and 2 shrinks):
expected: 23
but got: 24
1
or Hspec's shouldBe
ghci> import Test.QuickCheck
ghci> import Test.QuickCheck.IO
ghci> import Test.Hspec.Expectations
ghci> quickCheck $ \x -> x + 23 `shouldBe` 23
*** Failed! (after 3 tests and 2 shrinks):
expected: 23
but got: 24
1