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module Xanthous.Data.LevelsSpec (main, test) where
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import Test.Prelude
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import qualified Data.Aeson as JSON
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import Xanthous.Util (between)
import Xanthous.Data.Levels
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main :: IO ()
main = defaultMain test
test :: TestTree
test = testGroup "Xanthous.Data.Levels"
[ testGroup "current"
[ testProperty "view is extract" $ \(levels :: Levels Int) ->
levels ^. current === extract levels
, testProperty "set replaces current" $ \(levels :: Levels Int) new ->
extract (set current new levels) === new
, testProperty "set extract is id" $ \(levels :: Levels Int) ->
set current (extract levels) levels === levels
, testProperty "set y ∘ set x ≡ set y" $ \(levels :: Levels Int) x y ->
set current y (set current x levels) === set current y levels
]
, localOption (QuickCheckTests 20)
$ testBatch $ semigroup @(Levels Int) (error "unused", 1 :: Int)
, testGroup "next/prev"
[ testGroup "nextLevel"
[ testProperty "seeks forwards" $ \(levels :: Levels Int) genned ->
(pos . runIdentity . nextLevel (Identity genned) $ levels)
=== pos levels + 1
, testProperty "maintains the invariant" $ \(levels :: Levels Int) genned ->
let levels' = runIdentity . nextLevel (Identity genned) $ levels
in between 0 (toEnum $ length levels') $ pos levels'
, testProperty "extract is total" $ \(levels :: Levels Int) genned ->
let levels' = runIdentity . nextLevel (Identity genned) $ levels
in total $ extract levels'
, testProperty "uses the generated level as the next level"
$ \(levels :: Levels Int) genned ->
let levels' = seek (toEnum $ length levels - 1) levels
levels'' = runIdentity . nextLevel (Identity genned) $ levels'
in counterexample (show levels'')
$ extract levels'' === genned
]
, testGroup "prevLevel"
[ testProperty "seeks backwards" $ \(levels :: Levels Int) ->
case prevLevel levels of
Nothing -> property Discard
Just levels' -> pos levels' === pos levels - 1
, testProperty "maintains the invariant" $ \(levels :: Levels Int) ->
case prevLevel levels of
Nothing -> property Discard
Just levels' -> property $ between 0 (toEnum $ length levels') $ pos levels'
, testProperty "extract is total" $ \(levels :: Levels Int) ->
case prevLevel levels of
Nothing -> property Discard
Just levels' -> total $ extract levels'
]
]
, testGroup "JSON"
[ testProperty "toJSON/parseJSON round-trip" $ \(levels :: Levels Int) ->
JSON.decode (JSON.encode levels) === Just levels
]
]
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