562 lines
21 KiB
Haskell
562 lines
21 KiB
Haskell
{-# LANGUAGE CPP #-}
|
|
{-# LANGUAGE DataKinds #-}
|
|
{-# LANGUAGE DeriveGeneric #-}
|
|
{-# LANGUAGE FlexibleContexts #-}
|
|
{-# LANGUAGE FlexibleInstances #-}
|
|
{-# LANGUAGE FlexibleInstances #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE PolyKinds #-}
|
|
{-# LANGUAGE ScopedTypeVariables #-}
|
|
{-# LANGUAGE TypeFamilies #-}
|
|
{-# LANGUAGE TypeOperators #-}
|
|
{-# LANGUAGE TypeSynonymInstances #-}
|
|
|
|
module Servant.ServerSpec where
|
|
|
|
#if !MIN_VERSION_base(4,8,0)
|
|
import Control.Applicative ((<$>))
|
|
#endif
|
|
import Control.Monad (forM_, when, unless)
|
|
import Control.Monad.Trans.Except (ExceptT, throwE)
|
|
import Data.Aeson (FromJSON, ToJSON, decode', encode)
|
|
import Data.ByteString.Conversion ()
|
|
import Data.Char (toUpper)
|
|
import Data.Proxy (Proxy (Proxy))
|
|
import Data.String (fromString)
|
|
import Data.String.Conversions (cs)
|
|
import qualified Data.Text as T
|
|
import GHC.Generics (Generic)
|
|
import Network.HTTP.Types (Status (..), hAccept, hContentType,
|
|
methodDelete, methodGet,
|
|
methodHead, methodPatch,
|
|
methodPost, methodPut, ok200,
|
|
parseQuery)
|
|
import Network.Wai (Application, Request, pathInfo,
|
|
queryString, rawQueryString,
|
|
responseBuilder, responseLBS)
|
|
import Network.Wai.Internal (Response (ResponseBuilder))
|
|
import Network.Wai.Test (defaultRequest, request,
|
|
runSession, simpleBody,
|
|
simpleHeaders, simpleStatus)
|
|
import Servant.API ((:<|>) (..), (:>), Capture, Delete,
|
|
Get, Header (..),
|
|
Headers, HttpVersion,
|
|
IsSecure (..), JSON,
|
|
NoContent (..), Patch, PlainText,
|
|
Post, Put,
|
|
QueryFlag, QueryParam, QueryParams,
|
|
Raw, RemoteHost, ReqBody,
|
|
StdMethod (..), Verb, addHeader)
|
|
import Servant.API.Internal.Test.ComprehensiveAPI
|
|
import Servant.Server (ServantErr (..), Server, err404,
|
|
serve, Config(EmptyConfig))
|
|
import Test.Hspec (Spec, context, describe, it,
|
|
shouldBe, shouldContain)
|
|
import Test.Hspec.Wai (get, liftIO, matchHeaders,
|
|
matchStatus, request,
|
|
shouldRespondWith, with, (<:>))
|
|
|
|
import Servant.Server.Internal.RoutingApplication
|
|
(toApplication, RouteResult(..))
|
|
import Servant.Server.Internal.Router
|
|
(tweakResponse, runRouter,
|
|
Router, Router'(LeafRouter))
|
|
import Servant.Server.Internal.Config
|
|
(Config(..), NamedConfig(..))
|
|
|
|
-- * comprehensive api test
|
|
|
|
-- This declaration simply checks that all instances are in place.
|
|
_ = serve comprehensiveAPI comprehensiveApiConfig
|
|
|
|
comprehensiveApiConfig :: Config '[NamedConfig "foo" '[]]
|
|
comprehensiveApiConfig = NamedConfig EmptyConfig :. EmptyConfig
|
|
|
|
-- * Specs
|
|
|
|
spec :: Spec
|
|
spec = do
|
|
verbSpec
|
|
captureSpec
|
|
queryParamSpec
|
|
reqBodySpec
|
|
headerSpec
|
|
rawSpec
|
|
alternativeSpec
|
|
responseHeadersSpec
|
|
routerSpec
|
|
miscCombinatorSpec
|
|
|
|
------------------------------------------------------------------------------
|
|
-- * verbSpec {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
type VerbApi method status
|
|
= Verb method status '[JSON] Person
|
|
:<|> "noContent" :> Verb method status '[JSON] NoContent
|
|
:<|> "header" :> Verb method status '[JSON] (Headers '[Header "H" Int] Person)
|
|
:<|> "headerNC" :> Verb method status '[JSON] (Headers '[Header "H" Int] NoContent)
|
|
|
|
verbSpec :: Spec
|
|
verbSpec = describe "Servant.API.Verb" $ do
|
|
let server :: Server (VerbApi method status)
|
|
server = return alice
|
|
:<|> return NoContent
|
|
:<|> return (addHeader 5 alice)
|
|
:<|> return (addHeader 10 NoContent)
|
|
get200 = Proxy :: Proxy (VerbApi 'GET 200)
|
|
post210 = Proxy :: Proxy (VerbApi 'POST 210)
|
|
put203 = Proxy :: Proxy (VerbApi 'PUT 203)
|
|
delete280 = Proxy :: Proxy (VerbApi 'DELETE 280)
|
|
patch214 = Proxy :: Proxy (VerbApi 'PATCH 214)
|
|
wrongMethod m = if m == methodPatch then methodPost else methodPatch
|
|
test desc api method (status :: Int) = context desc $
|
|
|
|
with (return $ serve api EmptyConfig server) $ do
|
|
|
|
-- HEAD and 214/215 need not return bodies
|
|
unless (status `elem` [214, 215] || method == methodHead) $
|
|
it "returns the person" $ do
|
|
response <- Test.Hspec.Wai.request method "/" [] ""
|
|
liftIO $ statusCode (simpleStatus response) `shouldBe` status
|
|
liftIO $ decode' (simpleBody response) `shouldBe` Just alice
|
|
|
|
it "returns no content on NoContent" $ do
|
|
response <- Test.Hspec.Wai.request method "/noContent" [] ""
|
|
liftIO $ statusCode (simpleStatus response) `shouldBe` status
|
|
liftIO $ simpleBody response `shouldBe` ""
|
|
|
|
-- HEAD should not return body
|
|
when (method == methodHead) $
|
|
it "HEAD returns no content body" $ do
|
|
response <- Test.Hspec.Wai.request method "/" [] ""
|
|
liftIO $ simpleBody response `shouldBe` ""
|
|
|
|
it "throws 405 on wrong method " $ do
|
|
Test.Hspec.Wai.request (wrongMethod method) "/" [] ""
|
|
`shouldRespondWith` 405
|
|
|
|
it "returns headers" $ do
|
|
response1 <- Test.Hspec.Wai.request method "/header" [] ""
|
|
liftIO $ statusCode (simpleStatus response1) `shouldBe` status
|
|
liftIO $ simpleHeaders response1 `shouldContain` [("H", "5")]
|
|
|
|
response2 <- Test.Hspec.Wai.request method "/header" [] ""
|
|
liftIO $ statusCode (simpleStatus response2) `shouldBe` status
|
|
liftIO $ simpleHeaders response2 `shouldContain` [("H", "5")]
|
|
|
|
it "handles trailing '/' gracefully" $ do
|
|
response <- Test.Hspec.Wai.request method "/headerNC/" [] ""
|
|
liftIO $ statusCode (simpleStatus response) `shouldBe` status
|
|
|
|
it "returns 406 if the Accept header is not supported" $ do
|
|
Test.Hspec.Wai.request method "" [(hAccept, "crazy/mime")] ""
|
|
`shouldRespondWith` 406
|
|
|
|
it "responds if the Accept header is supported" $ do
|
|
response <- Test.Hspec.Wai.request method ""
|
|
[(hAccept, "application/json")] ""
|
|
liftIO $ statusCode (simpleStatus response) `shouldBe` status
|
|
|
|
it "sets the Content-Type header" $ do
|
|
response <- Test.Hspec.Wai.request method "" [] ""
|
|
liftIO $ simpleHeaders response `shouldContain`
|
|
[("Content-Type", "application/json")]
|
|
|
|
test "GET 200" get200 methodGet 200
|
|
test "POST 210" post210 methodPost 210
|
|
test "PUT 203" put203 methodPut 203
|
|
test "DELETE 280" delete280 methodDelete 280
|
|
test "PATCH 214" patch214 methodPatch 214
|
|
test "GET 200 with HEAD" get200 methodHead 200
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * captureSpec {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
type CaptureApi = Capture "legs" Integer :> Get '[JSON] Animal
|
|
captureApi :: Proxy CaptureApi
|
|
captureApi = Proxy
|
|
captureServer :: Integer -> ExceptT ServantErr IO Animal
|
|
captureServer legs = case legs of
|
|
4 -> return jerry
|
|
2 -> return tweety
|
|
_ -> throwE err404
|
|
|
|
captureSpec :: Spec
|
|
captureSpec = do
|
|
describe "Servant.API.Capture" $ do
|
|
with (return (serve captureApi EmptyConfig captureServer)) $ do
|
|
|
|
it "can capture parts of the 'pathInfo'" $ do
|
|
response <- get "/2"
|
|
liftIO $ decode' (simpleBody response) `shouldBe` Just tweety
|
|
|
|
it "returns 404 if the decoding fails" $ do
|
|
get "/notAnInt" `shouldRespondWith` 404
|
|
|
|
with (return (serve
|
|
(Proxy :: Proxy (Capture "captured" String :> Raw))
|
|
EmptyConfig
|
|
(\ "captured" request_ respond ->
|
|
respond $ responseLBS ok200 [] (cs $ show $ pathInfo request_)))) $ do
|
|
it "strips the captured path snippet from pathInfo" $ do
|
|
get "/captured/foo" `shouldRespondWith` (fromString (show ["foo" :: String]))
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * queryParamSpec {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
type QueryParamApi = QueryParam "name" String :> Get '[JSON] Person
|
|
:<|> "a" :> QueryParams "names" String :> Get '[JSON] Person
|
|
:<|> "b" :> QueryFlag "capitalize" :> Get '[JSON] Person
|
|
|
|
queryParamApi :: Proxy QueryParamApi
|
|
queryParamApi = Proxy
|
|
|
|
qpServer :: Server QueryParamApi
|
|
qpServer = queryParamServer :<|> qpNames :<|> qpCapitalize
|
|
|
|
where qpNames (_:name2:_) = return alice { name = name2 }
|
|
qpNames _ = return alice
|
|
|
|
qpCapitalize False = return alice
|
|
qpCapitalize True = return alice { name = map toUpper (name alice) }
|
|
|
|
queryParamServer (Just name_) = return alice{name = name_}
|
|
queryParamServer Nothing = return alice
|
|
|
|
queryParamSpec :: Spec
|
|
queryParamSpec = do
|
|
describe "Servant.API.QueryParam" $ do
|
|
it "allows retrieving simple GET parameters" $
|
|
(flip runSession) (serve queryParamApi EmptyConfig qpServer) $ do
|
|
let params1 = "?name=bob"
|
|
response1 <- Network.Wai.Test.request defaultRequest{
|
|
rawQueryString = params1,
|
|
queryString = parseQuery params1
|
|
}
|
|
liftIO $ do
|
|
decode' (simpleBody response1) `shouldBe` Just alice{
|
|
name = "bob"
|
|
}
|
|
|
|
it "allows retrieving lists in GET parameters" $
|
|
(flip runSession) (serve queryParamApi EmptyConfig qpServer) $ do
|
|
let params2 = "?names[]=bob&names[]=john"
|
|
response2 <- Network.Wai.Test.request defaultRequest{
|
|
rawQueryString = params2,
|
|
queryString = parseQuery params2,
|
|
pathInfo = ["a"]
|
|
}
|
|
liftIO $
|
|
decode' (simpleBody response2) `shouldBe` Just alice{
|
|
name = "john"
|
|
}
|
|
|
|
|
|
it "allows retrieving value-less GET parameters" $
|
|
(flip runSession) (serve queryParamApi EmptyConfig qpServer) $ do
|
|
let params3 = "?capitalize"
|
|
response3 <- Network.Wai.Test.request defaultRequest{
|
|
rawQueryString = params3,
|
|
queryString = parseQuery params3,
|
|
pathInfo = ["b"]
|
|
}
|
|
liftIO $
|
|
decode' (simpleBody response3) `shouldBe` Just alice{
|
|
name = "ALICE"
|
|
}
|
|
|
|
let params3' = "?capitalize="
|
|
response3' <- Network.Wai.Test.request defaultRequest{
|
|
rawQueryString = params3',
|
|
queryString = parseQuery params3',
|
|
pathInfo = ["b"]
|
|
}
|
|
liftIO $
|
|
decode' (simpleBody response3') `shouldBe` Just alice{
|
|
name = "ALICE"
|
|
}
|
|
|
|
let params3'' = "?unknown="
|
|
response3'' <- Network.Wai.Test.request defaultRequest{
|
|
rawQueryString = params3'',
|
|
queryString = parseQuery params3'',
|
|
pathInfo = ["b"]
|
|
}
|
|
liftIO $
|
|
decode' (simpleBody response3'') `shouldBe` Just alice{
|
|
name = "Alice"
|
|
}
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * reqBodySpec {{{
|
|
------------------------------------------------------------------------------
|
|
type ReqBodyApi = ReqBody '[JSON] Person :> Post '[JSON] Person
|
|
:<|> "blah" :> ReqBody '[JSON] Person :> Put '[JSON] Integer
|
|
|
|
reqBodyApi :: Proxy ReqBodyApi
|
|
reqBodyApi = Proxy
|
|
|
|
reqBodySpec :: Spec
|
|
reqBodySpec = describe "Servant.API.ReqBody" $ do
|
|
|
|
let server :: Server ReqBodyApi
|
|
server = return :<|> return . age
|
|
mkReq method x = Test.Hspec.Wai.request method x
|
|
[(hContentType, "application/json;charset=utf-8")]
|
|
|
|
with (return $ serve reqBodyApi EmptyConfig server) $ do
|
|
|
|
it "passes the argument to the handler" $ do
|
|
response <- mkReq methodPost "" (encode alice)
|
|
liftIO $ decode' (simpleBody response) `shouldBe` Just alice
|
|
|
|
it "rejects invalid request bodies with status 400" $ do
|
|
mkReq methodPut "/blah" "some invalid body" `shouldRespondWith` 400
|
|
|
|
it "responds with 415 if the request body media type is unsupported" $ do
|
|
Test.Hspec.Wai.request methodPost "/"
|
|
[(hContentType, "application/nonsense")] "" `shouldRespondWith` 415
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * headerSpec {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
type HeaderApi a = Header "MyHeader" a :> Delete '[JSON] ()
|
|
headerApi :: Proxy (HeaderApi a)
|
|
headerApi = Proxy
|
|
|
|
headerSpec :: Spec
|
|
headerSpec = describe "Servant.API.Header" $ do
|
|
|
|
let expectsInt :: Maybe Int -> ExceptT ServantErr IO ()
|
|
expectsInt (Just x) = when (x /= 5) $ error "Expected 5"
|
|
expectsInt Nothing = error "Expected an int"
|
|
|
|
let expectsString :: Maybe String -> ExceptT ServantErr IO ()
|
|
expectsString (Just x) = when (x /= "more from you") $ error "Expected more from you"
|
|
expectsString Nothing = error "Expected a string"
|
|
|
|
with (return (serve headerApi EmptyConfig expectsInt)) $ do
|
|
let delete' x = Test.Hspec.Wai.request methodDelete x [("MyHeader", "5")]
|
|
|
|
it "passes the header to the handler (Int)" $
|
|
delete' "/" "" `shouldRespondWith` 200
|
|
|
|
with (return (serve headerApi EmptyConfig expectsString)) $ do
|
|
let delete' x = Test.Hspec.Wai.request methodDelete x [("MyHeader", "more from you")]
|
|
|
|
it "passes the header to the handler (String)" $
|
|
delete' "/" "" `shouldRespondWith` 200
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * rawSpec {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
type RawApi = "foo" :> Raw
|
|
|
|
rawApi :: Proxy RawApi
|
|
rawApi = Proxy
|
|
|
|
rawApplication :: Show a => (Request -> a) -> Application
|
|
rawApplication f request_ respond = respond $ responseLBS ok200 []
|
|
(cs $ show $ f request_)
|
|
|
|
rawSpec :: Spec
|
|
rawSpec = do
|
|
describe "Servant.API.Raw" $ do
|
|
it "runs applications" $ do
|
|
(flip runSession) (serve rawApi EmptyConfig (rawApplication (const (42 :: Integer)))) $ do
|
|
response <- Network.Wai.Test.request defaultRequest{
|
|
pathInfo = ["foo"]
|
|
}
|
|
liftIO $ do
|
|
simpleBody response `shouldBe` "42"
|
|
|
|
it "gets the pathInfo modified" $ do
|
|
(flip runSession) (serve rawApi EmptyConfig (rawApplication pathInfo)) $ do
|
|
response <- Network.Wai.Test.request defaultRequest{
|
|
pathInfo = ["foo", "bar"]
|
|
}
|
|
liftIO $ do
|
|
simpleBody response `shouldBe` cs (show ["bar" :: String])
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * alternativeSpec {{{
|
|
------------------------------------------------------------------------------
|
|
type AlternativeApi =
|
|
"foo" :> Get '[JSON] Person
|
|
:<|> "bar" :> Get '[JSON] Animal
|
|
:<|> "foo" :> Get '[PlainText] T.Text
|
|
:<|> "bar" :> Post '[JSON] Animal
|
|
:<|> "bar" :> Put '[JSON] Animal
|
|
:<|> "bar" :> Delete '[JSON] ()
|
|
|
|
alternativeApi :: Proxy AlternativeApi
|
|
alternativeApi = Proxy
|
|
|
|
alternativeServer :: Server AlternativeApi
|
|
alternativeServer =
|
|
return alice
|
|
:<|> return jerry
|
|
:<|> return "a string"
|
|
:<|> return jerry
|
|
:<|> return jerry
|
|
:<|> return ()
|
|
|
|
alternativeSpec :: Spec
|
|
alternativeSpec = do
|
|
describe "Servant.API.Alternative" $ do
|
|
with (return $ serve alternativeApi EmptyConfig alternativeServer) $ do
|
|
|
|
it "unions endpoints" $ do
|
|
response <- get "/foo"
|
|
liftIO $ do
|
|
decode' (simpleBody response) `shouldBe`
|
|
Just alice
|
|
response_ <- get "/bar"
|
|
liftIO $ do
|
|
decode' (simpleBody response_) `shouldBe`
|
|
Just jerry
|
|
|
|
it "checks all endpoints before returning 415" $ do
|
|
get "/foo" `shouldRespondWith` 200
|
|
|
|
it "returns 404 if the path does not exist" $ do
|
|
get "/nonexistent" `shouldRespondWith` 404
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * responseHeaderSpec {{{
|
|
------------------------------------------------------------------------------
|
|
type ResponseHeadersApi =
|
|
Get '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
|
|
:<|> Post '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
|
|
:<|> Put '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
|
|
:<|> Patch '[JSON] (Headers '[Header "H1" Int, Header "H2" String] String)
|
|
|
|
|
|
responseHeadersServer :: Server ResponseHeadersApi
|
|
responseHeadersServer = let h = return $ addHeader 5 $ addHeader "kilroy" "hi"
|
|
in h :<|> h :<|> h :<|> h
|
|
|
|
|
|
responseHeadersSpec :: Spec
|
|
responseHeadersSpec = describe "ResponseHeaders" $ do
|
|
with (return $ serve (Proxy :: Proxy ResponseHeadersApi) EmptyConfig responseHeadersServer) $ do
|
|
|
|
let methods = [methodGet, methodPost, methodPut, methodPatch]
|
|
|
|
it "includes the headers in the response" $
|
|
forM_ methods $ \method ->
|
|
Test.Hspec.Wai.request method "/" [] ""
|
|
`shouldRespondWith` "\"hi\""{ matchHeaders = ["H1" <:> "5", "H2" <:> "kilroy"]
|
|
, matchStatus = 200
|
|
}
|
|
|
|
it "responds with not found for non-existent endpoints" $
|
|
forM_ methods $ \method ->
|
|
Test.Hspec.Wai.request method "blahblah" [] ""
|
|
`shouldRespondWith` 404
|
|
|
|
it "returns 406 if the Accept header is not supported" $
|
|
forM_ methods $ \method ->
|
|
Test.Hspec.Wai.request method "" [(hAccept, "crazy/mime")] ""
|
|
`shouldRespondWith` 406
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * routerSpec {{{
|
|
------------------------------------------------------------------------------
|
|
routerSpec :: Spec
|
|
routerSpec = do
|
|
describe "Servant.Server.Internal.Router" $ do
|
|
let app' :: Application
|
|
app' = toApplication $ runRouter router'
|
|
|
|
router', router :: Router
|
|
router' = tweakResponse (twk <$>) router
|
|
router = LeafRouter $ \_ cont -> cont (Route $ responseBuilder (Status 201 "") [] "")
|
|
|
|
twk :: Response -> Response
|
|
twk (ResponseBuilder (Status i s) hs b) = ResponseBuilder (Status (i + 1) s) hs b
|
|
twk b = b
|
|
|
|
describe "tweakResponse" . with (return app') $ do
|
|
it "calls f on route result" $ do
|
|
get "" `shouldRespondWith` 202
|
|
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * miscCombinatorSpec {{{
|
|
------------------------------------------------------------------------------
|
|
type MiscCombinatorsAPI
|
|
= "version" :> HttpVersion :> Get '[JSON] String
|
|
:<|> "secure" :> IsSecure :> Get '[JSON] String
|
|
:<|> "host" :> RemoteHost :> Get '[JSON] String
|
|
|
|
miscApi :: Proxy MiscCombinatorsAPI
|
|
miscApi = Proxy
|
|
|
|
miscServ :: Server MiscCombinatorsAPI
|
|
miscServ = versionHandler
|
|
:<|> secureHandler
|
|
:<|> hostHandler
|
|
|
|
where versionHandler = return . show
|
|
secureHandler Secure = return "secure"
|
|
secureHandler NotSecure = return "not secure"
|
|
hostHandler = return . show
|
|
|
|
miscCombinatorSpec :: Spec
|
|
miscCombinatorSpec = with (return $ serve miscApi EmptyConfig miscServ) $
|
|
describe "Misc. combinators for request inspection" $ do
|
|
it "Successfully gets the HTTP version specified in the request" $
|
|
go "/version" "\"HTTP/1.0\""
|
|
|
|
it "Checks that hspec-wai uses HTTP, not HTTPS" $
|
|
go "/secure" "\"not secure\""
|
|
|
|
it "Checks that hspec-wai issues request from 0.0.0.0" $
|
|
go "/host" "\"0.0.0.0:0\""
|
|
|
|
where go path res = Test.Hspec.Wai.get path `shouldRespondWith` res
|
|
-- }}}
|
|
------------------------------------------------------------------------------
|
|
-- * Test data types {{{
|
|
------------------------------------------------------------------------------
|
|
|
|
data Person = Person {
|
|
name :: String,
|
|
age :: Integer
|
|
}
|
|
deriving (Eq, Show, Generic)
|
|
|
|
instance ToJSON Person
|
|
instance FromJSON Person
|
|
|
|
alice :: Person
|
|
alice = Person "Alice" 42
|
|
|
|
data Animal = Animal {
|
|
species :: String,
|
|
numberOfLegs :: Integer
|
|
}
|
|
deriving (Eq, Show, Generic)
|
|
|
|
instance ToJSON Animal
|
|
instance FromJSON Animal
|
|
|
|
jerry :: Animal
|
|
jerry = Animal "Mouse" 4
|
|
|
|
tweety :: Animal
|
|
tweety = Animal "Bird" 2
|
|
-- }}}
|