82ecd61f5c
Change-Id: I6c6847fac56f0a9a1a2209792e00a3aec5e672b9 Reviewed-on: https://cl.tvl.fyi/c/depot/+/10809 Autosubmit: aspen <root@gws.fyi> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: lukegb <lukegb@tvl.fyi>
45 lines
1.7 KiB
Haskell
45 lines
1.7 KiB
Haskell
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module Xanthous.RandomSpec (main, test) where
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--------------------------------------------------------------------------------
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import Test.Prelude
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--------------------------------------------------------------------------------
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import Control.Monad.Random
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--------------------------------------------------------------------------------
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import Xanthous.Random
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import Xanthous.Orphans ()
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import qualified Data.Interval as Interval
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import Data.Interval (Interval, Extended (Finite), (<=..<=))
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--------------------------------------------------------------------------------
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main :: IO ()
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main = defaultMain test
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test :: TestTree
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test = testGroup "Xanthous.Random"
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[ testGroup "chooseSubset"
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[ testProperty "chooses a subset"
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$ \(l :: [Int]) (Positive (r :: Double)) -> randomTest $ do
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ss <- chooseSubset r l
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pure $ all (`elem` l) ss
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]
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, testGroup "chooseRange"
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[ testProperty "chooses in the range"
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$ \(rng :: Interval Int) ->
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not (Interval.null rng)
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==> randomTest ( do
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chooseRange rng >>= \case
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Just r -> pure
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. counterexample (show r)
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$ r `Interval.member` rng
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Nothing -> pure $ property Discard
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)
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, testProperty "nonEmpty range is never empty"
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$ \ (lower :: Int) (NonZero diff) -> randomTest $ do
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let upper = lower + diff
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r <- chooseRange (Finite lower <=..<= Finite upper)
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pure $ isJust r
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]
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]
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where
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randomTest prop = evalRandT prop . mkStdGen =<< arbitrary
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