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semantic/test/Diff/Spec.hs

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{-# LANGUAGE DataKinds #-}
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module Diff.Spec where
import Category
import Data.Record
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import Data.Text.Arbitrary ()
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import Diff
import Diff.Arbitrary
import Interpreter
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import Prologue
import Term.Arbitrary
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import Test.Hspec
import Test.Hspec.QuickCheck
import Test.QuickCheck
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spec :: Spec
spec = parallel $ do
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prop "equality is reflexive" $
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\ a b -> let diff = diffTerms wrap (==) diffCost (toTerm a) (toTerm (b :: ArbitraryTerm Text (Record '[Category]))) in
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diff `shouldBe` diff
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prop "equal terms produce identity diffs" $
\ a -> let term = toTerm (a :: ArbitraryTerm Text (Record '[Category])) in
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diffCost (diffTerms wrap (==) diffCost term term) `shouldBe` 0
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describe "beforeTerm" $ do
prop "recovers the before term" $
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\ a b -> let diff = diffTerms wrap (==) diffCost (toTerm a) (toTerm (b :: ArbitraryTerm Text (Record '[Category]))) in
beforeTerm diff `shouldBe` Just (toTerm a)
describe "afterTerm" $ do
prop "recovers the after term" $
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\ a b -> let diff = diffTerms wrap (==) diffCost (toTerm a) (toTerm (b :: ArbitraryTerm Text (Record '[Category]))) in
afterTerm diff `shouldBe` Just (toTerm b)
describe "ArbitraryDiff" $ do
prop "generates diffs of a specific size" . forAll ((arbitrary >>= \ n -> (,) n <$> diffOfSize n) `suchThat` ((> 0) . fst)) $
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\ (n, diff) -> arbitraryDiffSize (diff :: ArbitraryDiff Text ()) `shouldBe` n