48 lines
1.2 KiB
Haskell
48 lines
1.2 KiB
Haskell
{- QuickCheck with additional instances
|
|
-
|
|
- Copyright 2012-2014 Joey Hess <id@joeyh.name>
|
|
-
|
|
- License: BSD-2-clause
|
|
-}
|
|
|
|
{-# OPTIONS_GHC -fno-warn-orphans #-}
|
|
{-# LANGUAGE TypeSynonymInstances #-}
|
|
|
|
module Utility.QuickCheck
|
|
( module X
|
|
, module Utility.QuickCheck
|
|
) where
|
|
|
|
import Test.QuickCheck as X
|
|
import Data.Time.Clock.POSIX
|
|
import Data.Ratio
|
|
import System.Posix.Types
|
|
import Prelude
|
|
|
|
{- Times before the epoch are excluded. Half with decimal and half without. -}
|
|
instance Arbitrary POSIXTime where
|
|
arbitrary = do
|
|
n <- nonNegative arbitrarySizedBoundedIntegral :: Gen Int
|
|
d <- nonNegative arbitrarySizedIntegral
|
|
withd <- arbitrary
|
|
return $ if withd
|
|
then fromIntegral n + fromRational (1 % max d 1)
|
|
else fromIntegral n
|
|
|
|
{- Pids are never negative, or 0. -}
|
|
instance Arbitrary ProcessID where
|
|
arbitrary = positive arbitrarySizedBoundedIntegral
|
|
|
|
{- Inodes are never negative. -}
|
|
instance Arbitrary FileID where
|
|
arbitrary = nonNegative arbitrarySizedIntegral
|
|
|
|
{- File sizes are never negative. -}
|
|
instance Arbitrary FileOffset where
|
|
arbitrary = nonNegative arbitrarySizedIntegral
|
|
|
|
nonNegative :: (Num a, Ord a) => Gen a -> Gen a
|
|
nonNegative g = g `suchThat` (>= 0)
|
|
|
|
positive :: (Num a, Ord a) => Gen a -> Gen a
|
|
positive g = g `suchThat` (> 0)
|