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diff --git a/Haskell-book/14/morse/tests/CoArbitrary.hs b/Haskell-book/14/morse/tests/CoArbitrary.hs
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+++ b/Haskell-book/14/morse/tests/CoArbitrary.hs
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+{-# LANGUAGE DeriveGeneric #-}
+
+module CoArbitrary where
+
+import GHC.Generics
+import Test.QuickCheck
+
+data Bool' = True' | False' deriving (Generic)
+
+instance CoArbitrary Bool'
+
+trueGen :: Gen Int
+trueGen = coarbitrary True' arbitrary
+
+falseGen :: Gen Int
+falseGen = coarbitrary False' arbitrary
+\ No newline at end of file