hspecVariant-1.0.0.0: README.md

# hspecVariant

Spec for testing properties for variant types

[![hspecVariant](https://img.shields.io/badge/hspecVariant-v1.0.0.0-blue.svg?style=plastic)](https://hackage.haskell.org/package/hspecVariant)

```haskell
{-# LANGUAGE TypeSynonymInstances #-}
import Test.QuickCheck.Variant

type Natural = Integer

instance Variant Natural where
  invalid = do
    n <- arbitrary
    if (n<0) then return n else return ((-1)*(n+1))
  valid = do
    n <- arbitrary
    if (n>=0) then return n else return ((-1)*n)
```

Test

```haskell
import Test.Hspec
import Test.Hspec.Variant

main::IO ()
main = hspec $
  describe "Naturals" $
    propValid "succ" $
      \x -> succ (x::Natural) > 0
```

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