hedgehog-quickcheck: Use QuickCheck generators in Hedgehog and vice versa.

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Use QuickCheck generators in Hedgehog and vice versa.

Hedgehog is a modern property-based testing system, in the spirit of QuickCheck. Hedgehog uses integrated shrinking, so shrinks obey the invariants of generated values by construction.

To get started quickly, see the examples: <https://github.com/hedgehogqa/haskell-hedgehog/tree/master/hedgehog-


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Properties

Versions0.1, 0.1.1, 0.1.1
Change logCHANGELOG.md
Dependenciesbase (>=3 && <5), hedgehog (>=0.5 && <1.1), QuickCheck (>=2.7 && <2.14), transformers (>=0.4 && <0.6) [details]
LicenseBSD-3-Clause
AuthorJacob Stanley
MaintainerJacob Stanley <jacob@stanley.io>
CategoryTesting
Home pagehttps://hedgehog.qa
Bug trackerhttps://github.com/hedgehogqa/haskell-hedgehog/issues
Source repositoryhead: git clone git://github.com/hedgehogqa/haskell-hedgehog.git
UploadedSat May 18 03:42:05 UTC 2019 by JacobStanley

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Readme for hedgehog-quickcheck-0.1.1

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hedgehog-quickcheck Hackage

Hedgehog will eat all your bugs.

<img src="https://github.com/hedgehogqa/haskell-hedgehog/raw/master/img/hedgehog-logo.png" width="307" align="right"/>

Use QuickCheck generators in Hedgehog and vice versa.

Example

The Hedgehog.Gen.QuickCheck module allows the use of QuickCheck generators inside Hedgehog.

{-# LANGUAGE TemplateHaskell #-}

import           Hedgehog
import qualified Hedgehog.Gen as Gen
import qualified Hedgehog.Gen.QuickCheck as Gen
import qualified Hedgehog.Range as Range

Once you have your imports set up, you can write a property which mixes QuickCheck and Hedgehog generators together:

prop_reverse :: Property
prop_reverse =
  property $ do
    xs <- forAll $ Gen.list (Range.linear 0 100) (Gen.arbitrary :: Gen Char)
    reverse (reverse xs) === xs

And add the Template Haskell splice which will discover your properties:

tests :: IO Bool
tests =
  checkParallel $$(discover)

You can then load the module in GHCi, and run it:

λ tests
━━━ Test.Example ━━━
  ✓ prop_reverse passed 100 tests.