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author | Joey Hess <joeyh@joeyh.name> | 2021-01-11 21:52:32 -0400 |
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committer | Joey Hess <joeyh@joeyh.name> | 2021-01-11 21:52:32 -0400 |
commit | ad48349741384ed0e49fab9cf13ac7f90aba0dd1 (patch) | |
tree | 6b8c894ce1057d069f89e7209c266f00ea43ec66 /Utility/QuickCheck.hs | |
parent | b3e72e94efbce652f25fb99d6c6ace8beb2a52d4 (diff) | |
download | git-repair-ad48349741384ed0e49fab9cf13ac7f90aba0dd1.tar.gz |
Merge from git-annex.
Diffstat (limited to 'Utility/QuickCheck.hs')
-rw-r--r-- | Utility/QuickCheck.hs | 41 |
1 files changed, 39 insertions, 2 deletions
diff --git a/Utility/QuickCheck.hs b/Utility/QuickCheck.hs index b0a39f3..2093670 100644 --- a/Utility/QuickCheck.hs +++ b/Utility/QuickCheck.hs @@ -1,6 +1,6 @@ {- QuickCheck with additional instances - - - Copyright 2012-2014 Joey Hess <id@joeyh.name> + - Copyright 2012-2020 Joey Hess <id@joeyh.name> - - License: BSD-2-clause -} @@ -10,16 +10,53 @@ module Utility.QuickCheck ( module X - , module Utility.QuickCheck + , TestableString + , fromTestableString + , TestableFilePath + , fromTestableFilePath + , nonNegative + , positive ) where import Test.QuickCheck as X import Data.Time.Clock.POSIX import Data.Ratio +import Data.Char import System.Posix.Types import Data.List.NonEmpty (NonEmpty(..)) import Prelude +{- A String, but Arbitrary is limited to ascii. + - + - When in a non-utf8 locale, String does not normally contain any non-ascii + - characters, except for ones in surrogate plane. Converting a string that + - does contain other unicode characters to a ByteString using the + - filesystem encoding (see GHC.IO.Encoding) will throw an exception, + - so use this instead to avoid quickcheck tests breaking unncessarily. + -} +newtype TestableString = TestableString + { fromTestableString :: String } + deriving (Show) + +instance Arbitrary TestableString where + arbitrary = TestableString . filter isAscii <$> arbitrary + +{- FilePath constrained to not be the empty string, not contain a NUL, + - and contain only ascii. + - + - No real-world filename can be empty or contain a NUL. So code can + - well be written that assumes that and using this avoids quickcheck + - tests breaking unncessarily. + -} +newtype TestableFilePath = TestableFilePath + { fromTestableFilePath :: FilePath } + deriving (Show) + +instance Arbitrary TestableFilePath where + arbitrary = (TestableFilePath . fromTestableString <$> arbitrary) + `suchThat` (not . null . fromTestableFilePath) + `suchThat` (not . any (== '\NUL') . fromTestableFilePath) + {- Times before the epoch are excluded. Half with decimal and half without. -} instance Arbitrary POSIXTime where arbitrary = do |