37 lines
986 B
Haskell
37 lines
986 B
Haskell
{- QuickCheck instances
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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{-# LANGUAGE TypeSynonymInstances #-}
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module Utility.QuickCheck where
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import Test.QuickCheck
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import Data.Time.Clock.POSIX
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import System.Posix.Types
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{- Times before the epoch are excluded. -}
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instance Arbitrary POSIXTime where
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arbitrary = nonNegative arbitrarySizedIntegral
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instance Arbitrary EpochTime where
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arbitrary = nonNegative arbitrarySizedIntegral
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{- Pids are never negative, or 0. -}
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instance Arbitrary ProcessID where
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arbitrary = arbitrarySizedBoundedIntegral `suchThat` (> 0)
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{- Inodes are never negative. -}
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instance Arbitrary FileID where
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arbitrary = nonNegative arbitrarySizedIntegral
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{- File sizes are never negative. -}
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instance Arbitrary FileOffset where
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arbitrary = nonNegative arbitrarySizedIntegral
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nonNegative :: (Num a, Ord a) => Gen a -> Gen a
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nonNegative g = g `suchThat` (>= 0)
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