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60 lines
2.8 KiB
Haskell
60 lines
2.8 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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module Diffing.Interpreter.Spec where
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import Data.Diff
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import Data.Functor.Listable
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import Data.Record
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import Data.Sum
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import Data.Term
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import Data.These
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import Diffing.Interpreter
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import qualified Data.Syntax as Syntax
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import Test.Hspec (Spec, describe, it, parallel)
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import Test.Hspec.Expectations.Pretty
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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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describe "diffTerms" $ do
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it "returns a replacement when comparing two unicode equivalent terms" $
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let termA = termIn Nil (inject (Syntax.Identifier "t\776"))
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termB = termIn Nil (inject (Syntax.Identifier "\7831")) in
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diffTerms termA termB `shouldBe` replacing termA (termB :: Term ListableSyntax (Record '[]))
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prop "produces correct diffs" $
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\ a b -> let diff = diffTerms a b :: Diff ListableSyntax (Record '[]) (Record '[]) in
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(beforeTerm diff, afterTerm diff) `shouldBe` (Just a, Just b)
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prop "produces identity diffs for equal terms " $
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\ a -> let diff = diffTerms a a :: Diff ListableSyntax (Record '[]) (Record '[]) in
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length (diffPatches diff) `shouldBe` 0
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it "produces unbiased insertions within branches" $
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let term s = termIn Nil (inject [ termIn Nil (inject (Syntax.Identifier s)) ]) :: Term ListableSyntax (Record '[])
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wrap = termIn Nil . inject in
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diffTerms (wrap [ term "b" ]) (wrap [ term "a", term "b" ]) `shouldBe` merge (Nil, Nil) (inject [ inserting (term "a"), merging (term "b") ])
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prop "compares nodes against context" $
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\ a b -> diffTerms a (termIn Nil (inject (Syntax.Context (pure b) a))) `shouldBe` insertF (In Nil (inject (Syntax.Context (pure (inserting b)) (merging (a :: Term ListableSyntax (Record '[]))))))
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prop "diffs forward permutations as changes" $
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\ a -> let wrap = termIn Nil . inject
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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) (inject [ inserting c, merging a, merging b, deleting c ])
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prop "diffs backward permutations as changes" $
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\ a -> let wrap = termIn Nil . inject
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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) (inject [ deleting a, merging b, merging c, inserting a ])
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describe "diffTermPair" $ do
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prop "produces an Insert when the first term is missing" $ do
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\ after -> let diff = diffTermPair (That after) :: Diff ListableSyntax (Record '[]) (Record '[]) in
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diff `shouldBe` inserting after
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prop "produces a Delete when the second term is missing" $ do
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\ before -> let diff = diffTermPair (This before) :: Diff ListableSyntax (Record '[]) (Record '[]) in
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diff `shouldBe` deleting before
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