Add quickcheck-text to generate arbitrary utf-8

semantic-diff.cabal

@@ -91,9 +91,10 @@ test-suite semantic-diff-test
                      , QuickCheck >= 2.8.1
                      , semantic-diff
                      , text >= 1.2.1.3
+                     , quickcheck-text
   ghc-options:         -threaded -rtsopts -with-rtsopts=-N
   default-language:    Haskell2010
-  default-extensions:  DeriveGeneric
+  default-extensions:  DeriveGeneric, OverloadedStrings
 
 source-repository head
   type:     git

test/Spec.hs

@@ -20,6 +20,8 @@ import GHC.Generics
 import Test.Hspec
 import Test.Hspec.QuickCheck
 import Test.QuickCheck hiding (Fixed)
+import Data.Text.Arbitrary ()
+import qualified Data.Text as T
 
 newtype ArbitraryTerm a annotation = ArbitraryTerm (annotation, (Syntax a (ArbitraryTerm a annotation)))
   deriving (Show, Eq, Generic)