quickcheck-combinators: Simple type-level combinators for augmenting QuickCheck instances.

Simply wrap the type you want to generate (assuming it satisfies all the necessary constraints) to refine the terms generated:

{-# LANGUAGE DataKinds #-}

import Data.Set (Set)
import Test.QuickCheck
import Test.QuickCheck.Instances
import GHC.TypeLits

instance Arbitrary LinearEquation where
  arbitrary = do
    vars <- arbitrary :: Gen (AtLeast 3 Set String)
    -- ...

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• quickcheck-combinators-0.0.4.tar.gz [browse] (Cabal source package)
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• athanclark

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