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45 lines
1.5 KiB
Haskell
45 lines
1.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Generators
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( source
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, integerScientific
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, rationalScientific
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, floatingScientific
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, classifyScientific
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) where
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import Data.Ratio ((%))
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import Data.Scientific (Scientific)
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import qualified Data.Scientific as Scientific
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import Hedgehog
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import qualified Hedgehog.Gen as Gen
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import qualified Source.Source
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source :: MonadGen m => Hedgehog.Range Int -> m Source.Source.Source
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source r = Gen.frequency [ (1, empty), (20, nonEmpty) ]
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where empty = pure mempty
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nonEmpty = Source.Source.fromUTF8 <$> Gen.utf8 r (Gen.frequency [ (1, pure '\r'), (1, pure '\n'), (20, Gen.unicode) ])
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integerScientific :: MonadGen m => Hedgehog.Range Integer -> m Scientific
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integerScientific = fmap fromIntegral . Gen.integral
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rationalScientific :: MonadGen m => Hedgehog.Range Integer -> Hedgehog.Range Integer -> m Scientific
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rationalScientific nrange drange = do
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num <- Gen.integral nrange
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den <- Gen.integral drange
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let goodDen = if den == 0 then 1 else den
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let digitLimit = Just 25
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case Scientific.fromRationalRepetend digitLimit (num % goodDen) of
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Left (sci, _) -> pure sci
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Right (sci, _) -> pure sci
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floatingScientific :: MonadGen m => Hedgehog.Range Double -> m Scientific
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floatingScientific = fmap Scientific.fromFloatDigits . Gen.double
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classifyScientific :: MonadTest m => Scientific -> m ()
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classifyScientific sci = do
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classify "negative" $ sci < 0
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classify "small" $ (sci > 0 && sci <= 1)
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classify "medium" $ (sci > 1 && sci <= 10000)
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classify "large" $ sci > 10000
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