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45 lines
1.7 KiB
Haskell
45 lines
1.7 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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module DiffSpec where
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import Data.Diff
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import Data.Functor.Both
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import Data.Functor.Foldable (cata)
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import Data.Functor.Listable (ListableSyntax)
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import Data.Record
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import Data.Term
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import Data.Union
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import Interpreter
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import RWS
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import Test.Hspec
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import Test.Hspec.LeanCheck
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spec :: Spec
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spec = parallel $ do
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prop "equality is reflexive" $
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\ diff -> diff `shouldBe` (diff :: Diff ListableSyntax (Record '[]) (Record '[]))
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prop "equal terms produce identity diffs" $
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\ term -> diffCost (diffTerms term (term :: Term ListableSyntax (Record '[]))) `shouldBe` 0
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describe "beforeTerm" $ do
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prop "recovers the before term" $
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\ a b -> let diff = diffTerms a b :: Diff ListableSyntax (Record '[]) (Record '[]) in
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beforeTerm diff `shouldBe` Just a
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describe "afterTerm" $ do
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prop "recovers the after term" $
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\ a b -> let diff = diffTerms a b :: Diff ListableSyntax (Record '[]) (Record '[]) in
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afterTerm diff `shouldBe` Just b
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prop "forward permutations are changes" $ pendingWith "https://github.com/github/semantic-diff/issues/1359"
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-- \ a -> let wrap = termIn Nil . inj
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-- b = wrap [a]
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-- c = wrap [a, b] in
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-- diffTerms (wrap [a, b, c]) (wrap [c, a, b :: Term ListableSyntax (Record '[])]) `shouldBe` merge (Nil, Nil) (inj [ inserting c, merging a, merging b, deleting c ])
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prop "backward permutations are changes" $
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\ a -> let wrap = termIn Nil . inj
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b = wrap [a]
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c = wrap [a, b] in
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diffTerms (wrap [a, b, c]) (wrap [b, c, a :: Term ListableSyntax (Record '[])]) `shouldBe` merge (Nil, Nil) (inj [ deleting a, merging b, merging c, inserting a ])
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