Testing Acid-State with hspec

i'm a haskell noob and have problems with testing functions with acid-states.This ist my Datastructure

data UserState = UserState { name :: String }
    deriving (Eq, Ord, Read, Show, Data, Typeable)

and this is the function i want to test:

setName :: String -> Update UserState String                  
setName n =      
    do c@UserState{..} <- get 
       let newName = name 
       put $ c { name = newName } 
       return newName
$(makeAcidic ''UserState ['setName ])

This is my test:

spec :: Spec
spec = do
  describe "test" $
    it "test" $ do
            setName "Mike" `shouldBe` expected

I have no idea how to model my expected values.