servant/servant-server/test/Servant/ServerSpec.hs

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TypeSynonymInstances #-}
{-# LANGUAGE FlexibleInstances #-}
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module Servant.ServerSpec where
import Control.Monad (forM_, when)
import Control.Monad.Trans.Either (EitherT, left)
import Data.Aeson (FromJSON, ToJSON, decode', encode)
import Data.ByteString.Conversion ()
import Data.Char (toUpper)
import Data.Monoid ((<>))
import Data.Proxy (Proxy (Proxy))
import Data.String (fromString)
import Data.String.Conversions (cs)
import qualified Data.Text as T
import GHC.Generics (Generic)
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import Network.HTTP.Types (hAccept, hContentType,
methodDelete, methodGet,
methodPatch, methodPost, methodPut,
ok200, parseQuery, status409)
import Network.Wai (Application, Request, pathInfo,
queryString, rawQueryString,
responseLBS)
import Network.Wai.Test (defaultRequest, request,
runSession, simpleBody)
import Test.Hspec (Spec, describe, it, shouldBe)
import Test.Hspec.Wai (get, liftIO, matchHeaders,
matchStatus, post, request,
shouldRespondWith, with, (<:>))
import Servant.API ((:<|>) (..), (:>),
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addHeader, Capture,
Delete, Get, Header (..), Headers,
JSON, MatrixFlag, MatrixParam,
MatrixParams, Patch, PlainText,
Post, Put, QueryFlag, QueryParam,
QueryParams, Raw, ReqBody)
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import Servant.Server (Server, serve, ServantErr(..), err404)
import Servant.Server.Internal.RoutingApplication
(RouteMismatch (..))
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-- * test data types
data Person = Person {
name :: String,
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age :: Integer
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}
deriving (Eq, Show, Generic)
instance ToJSON Person
instance FromJSON Person
alice :: Person
alice = Person "Alice" 42
data Animal = Animal {
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species :: String,
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numberOfLegs :: Integer
}
deriving (Eq, Show, Generic)
instance ToJSON Animal
instance FromJSON Animal
jerry :: Animal
jerry = Animal "Mouse" 4
tweety :: Animal
tweety = Animal "Bird" 2
-- * specs
spec :: Spec
spec = do
captureSpec
getSpec
postSpec
putSpec
patchSpec
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queryParamSpec
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matrixParamSpec
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headerSpec
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rawSpec
unionSpec
prioErrorsSpec
errorsSpec
responseHeadersSpec
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type CaptureApi = Capture "legs" Integer :> Get '[JSON] Animal
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captureApi :: Proxy CaptureApi
captureApi = Proxy
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captureServer :: Integer -> EitherT ServantErr IO Animal
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captureServer legs = case legs of
4 -> return jerry
2 -> return tweety
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_ -> left err404
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captureSpec :: Spec
captureSpec = do
describe "Servant.API.Capture" $ do
with (return (serve captureApi captureServer)) $ do
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it "can capture parts of the 'pathInfo'" $ do
response <- get "/2"
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liftIO $ decode' (simpleBody response) `shouldBe` Just tweety
it "returns 404 if the decoding fails" $ do
get "/notAnInt" `shouldRespondWith` 404
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with (return (serve
(Proxy :: Proxy (Capture "captured" String :> Raw))
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(\ "captured" request_ respond ->
respond $ responseLBS ok200 [] (cs $ show $ pathInfo request_)))) $ do
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it "strips the captured path snippet from pathInfo" $ do
get "/captured/foo" `shouldRespondWith` (fromString (show ["foo" :: String]))
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type GetApi = Get '[JSON] Person
:<|> "empty" :> Get '[] ()
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getApi :: Proxy GetApi
getApi = Proxy
getSpec :: Spec
getSpec = do
describe "Servant.API.Get" $ do
let server = return alice :<|> return ()
with (return $ serve getApi server) $ do
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it "allows to GET a Person" $ do
response <- get "/"
return response `shouldRespondWith` 200
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liftIO $ decode' (simpleBody response) `shouldBe` Just alice
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it "throws 405 (wrong method) on POSTs" $ do
post "/" "" `shouldRespondWith` 405
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post "/empty" "" `shouldRespondWith` 405
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it "returns 204 if the type is '()'" $ do
get "empty" `shouldRespondWith` ""{ matchStatus = 204 }
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it "returns 415 if the Accept header is not supported" $ do
Test.Hspec.Wai.request methodGet "" [(hAccept, "crazy/mime")] ""
`shouldRespondWith` 415
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type QueryParamApi = QueryParam "name" String :> Get '[JSON] Person
:<|> "a" :> QueryParams "names" String :> Get '[JSON] Person
:<|> "b" :> QueryFlag "capitalize" :> Get '[JSON] Person
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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) }
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queryParamServer (Just name_) = return alice{name = name_}
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queryParamServer Nothing = return alice
queryParamSpec :: Spec
queryParamSpec = do
describe "Servant.API.QueryParam" $ do
it "allows to retrieve simple GET parameters" $
(flip runSession) (serve queryParamApi 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 to retrieve lists in GET parameters" $
(flip runSession) (serve queryParamApi 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"
}
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it "allows to retrieve value-less GET parameters" $
(flip runSession) (serve queryParamApi 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"
}
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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"
}
type MatrixParamApi = "a" :> MatrixParam "name" String :> Get '[JSON] Person
:<|> "b" :> MatrixParams "names" String :> "bsub" :> MatrixParams "names" String :> Get '[JSON] Person
:<|> "c" :> MatrixFlag "capitalize" :> Get '[JSON] Person
:<|> "d" :> Capture "foo" Integer :> MatrixParam "name" String :> MatrixFlag "capitalize" :> "dsub" :> Get '[JSON] Person
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matrixParamApi :: Proxy MatrixParamApi
matrixParamApi = Proxy
mpServer :: Server MatrixParamApi
mpServer = matrixParamServer :<|> mpNames :<|> mpCapitalize alice :<|> mpComplex
where mpNames (_:name2:_) _ = return alice { name = name2 }
mpNames _ _ = return alice
mpCapitalize p False = return p
mpCapitalize p True = return p { name = map toUpper (name p) }
matrixParamServer (Just name) = return alice{name = name}
matrixParamServer Nothing = return alice
mpAge age p = return p { age = age }
mpComplex capture name cap = matrixParamServer name >>= flip mpCapitalize cap >>= mpAge capture
matrixParamSpec :: Spec
matrixParamSpec = do
describe "Servant.API.MatrixParam" $ do
it "allows to retrieve simple matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response1 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["a;name=bob"]
}
liftIO $ do
decode' (simpleBody response1) `shouldBe` Just alice{
name = "bob"
}
it "allows to retrieve lists in matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response2 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["b;names=bob;names=john", "bsub;names=anna;names=sarah"]
}
liftIO $
decode' (simpleBody response2) `shouldBe` Just alice{
name = "john"
}
it "allows to retrieve value-less matrix parameters" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response3 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["c;capitalize"]
}
liftIO $
decode' (simpleBody response3) `shouldBe` Just alice{
name = "ALICE"
}
response3' <- Network.Wai.Test.request defaultRequest{
pathInfo = ["c;capitalize="]
}
liftIO $
decode' (simpleBody response3') `shouldBe` Just alice{
name = "ALICE"
}
it "allows to retrieve matrix parameters on captured segments" $
(flip runSession) (serve matrixParamApi mpServer) $ do
response4 <- Network.Wai.Test.request defaultRequest{
pathInfo = ["d", "12;name=stephen;capitalize", "dsub"]
}
liftIO $
decode' (simpleBody response4) `shouldBe` Just alice{
name = "STEPHEN",
age = 12
}
response4' <- Network.Wai.Test.request defaultRequest{
pathInfo = ["d;ignored=1", "5", "dsub"]
}
liftIO $
decode' (simpleBody response4') `shouldBe` Just alice{
name = "Alice",
age = 5
}
type PostApi =
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ReqBody '[JSON] Person :> Post '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Post '[JSON] Integer
:<|> "empty" :> Post '[] ()
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postApi :: Proxy PostApi
postApi = Proxy
postSpec :: Spec
postSpec = do
describe "Servant.API.Post and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve postApi server) $ do
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let post' x = Test.Hspec.Wai.request methodPost x [(hContentType
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, "application/json;charset=utf-8")]
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it "allows to POST a Person" $ do
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post' "/" (encode alice) `shouldRespondWith` "42"{
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matchStatus = 201
}
it "allows alternative routes if all have request bodies" $ do
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post' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 201
}
it "handles trailing '/' gracefully" $ do
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post' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 201
}
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it "correctly rejects invalid request bodies with status 400" $ do
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post' "/" "some invalid body" `shouldRespondWith` 400
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it "returns 204 if the type is '()'" $ do
post' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let post'' x = Test.Hspec.Wai.request methodPost x [(hContentType
, "application/nonsense")]
post'' "/" "anything at all" `shouldRespondWith` 415
type PutApi =
ReqBody '[JSON] Person :> Put '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Put '[JSON] Integer
:<|> "empty" :> Put '[] ()
putApi :: Proxy PutApi
putApi = Proxy
putSpec :: Spec
putSpec = do
describe "Servant.API.Put and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve putApi server) $ do
let put' x = Test.Hspec.Wai.request methodPut x [(hContentType
, "application/json;charset=utf-8")]
it "allows to put a Person" $ do
put' "/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "allows alternative routes if all have request bodies" $ do
put' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "handles trailing '/' gracefully" $ do
put' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "correctly rejects invalid request bodies with status 400" $ do
put' "/" "some invalid body" `shouldRespondWith` 400
it "returns 204 if the type is '()'" $ do
put' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let put'' x = Test.Hspec.Wai.request methodPut x [(hContentType
, "application/nonsense")]
put'' "/" "anything at all" `shouldRespondWith` 415
type PatchApi =
ReqBody '[JSON] Person :> Patch '[JSON] Integer
:<|> "bla" :> ReqBody '[JSON] Person :> Patch '[JSON] Integer
:<|> "empty" :> Patch '[] ()
patchApi :: Proxy PatchApi
patchApi = Proxy
patchSpec :: Spec
patchSpec = do
describe "Servant.API.Patch and .ReqBody" $ do
let server = return . age :<|> return . age :<|> return ()
with (return $ serve patchApi server) $ do
let patch' x = Test.Hspec.Wai.request methodPatch x [(hContentType
, "application/json;charset=utf-8")]
it "allows to patch a Person" $ do
patch' "/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "allows alternative routes if all have request bodies" $ do
patch' "/bla" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "handles trailing '/' gracefully" $ do
patch' "/bla/" (encode alice) `shouldRespondWith` "42"{
matchStatus = 200
}
it "correctly rejects invalid request bodies with status 400" $ do
patch' "/" "some invalid body" `shouldRespondWith` 400
it "returns 204 if the type is '()'" $ do
patch' "empty" "" `shouldRespondWith` ""{ matchStatus = 204 }
it "responds with 415 if the requested media type is unsupported" $ do
let patch'' x = Test.Hspec.Wai.request methodPatch x [(hContentType
, "application/nonsense")]
patch'' "/" "anything at all" `shouldRespondWith` 415
type HeaderApi a = Header "MyHeader" a :> Delete '[JSON] ()
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headerApi :: Proxy (HeaderApi a)
headerApi = Proxy
headerSpec :: Spec
headerSpec = describe "Servant.API.Header" $ do
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let expectsInt :: Maybe Int -> EitherT ServantErr IO ()
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expectsInt (Just x) = when (x /= 5) $ error "Expected 5"
expectsInt Nothing = error "Expected an int"
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let expectsString :: Maybe String -> EitherT ServantErr IO ()
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expectsString (Just x) = when (x /= "more from you") $ error "Expected more from you"
expectsString Nothing = error "Expected a string"
with (return (serve headerApi expectsInt)) $ do
let delete' x = Test.Hspec.Wai.request methodDelete x [("MyHeader" ,"5")]
it "passes the header to the handler (Int)" $
delete' "/" "" `shouldRespondWith` 204
with (return (serve headerApi 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` 204
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type RawApi = "foo" :> Raw
rawApi :: Proxy RawApi
rawApi = Proxy
rawApplication :: Show a => (Request -> a) -> Application
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rawApplication f request_ respond = respond $ responseLBS ok200 [] (cs $ show $ f request_)
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rawSpec :: Spec
rawSpec = do
describe "Servant.API.Raw" $ do
it "runs applications" $ do
(flip runSession) (serve rawApi (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 (rawApplication pathInfo)) $ do
response <- Network.Wai.Test.request defaultRequest{
pathInfo = ["foo", "bar"]
}
liftIO $ do
simpleBody response `shouldBe` cs (show ["bar" :: String])
type AlternativeApi =
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"foo" :> Get '[JSON] Person
:<|> "bar" :> Get '[JSON] Animal
:<|> "foo" :> Get '[PlainText] T.Text
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:<|> "bar" :> Post '[JSON] Animal
:<|> "bar" :> Put '[JSON] Animal
:<|> "bar" :> Delete '[JSON] ()
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unionApi :: Proxy AlternativeApi
unionApi = Proxy
unionServer :: Server AlternativeApi
unionServer =
return alice
:<|> return jerry
:<|> return "a string"
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:<|> return jerry
:<|> return jerry
:<|> return ()
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unionSpec :: Spec
unionSpec = do
describe "Servant.API.Alternative" $ do
with (return $ serve unionApi unionServer) $ do
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it "unions endpoints" $ do
response <- get "/foo"
liftIO $ do
decode' (simpleBody response) `shouldBe`
Just alice
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response_ <- get "/bar"
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liftIO $ do
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decode' (simpleBody response_) `shouldBe`
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Just jerry
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it "checks all endpoints before returning 415" $ do
get "/foo" `shouldRespondWith` 200
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it "returns 404 if the path does not exist" $ do
get "/nonexistent" `shouldRespondWith` 404
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) responseHeadersServer) $ do
let methods = [(methodGet, 200), (methodPost, 201), (methodPut, 200), (methodPatch, 200)]
it "includes the headers in the response" $
forM_ methods $ \(method, expected) ->
Test.Hspec.Wai.request method "/" [] ""
`shouldRespondWith` "\"hi\""{ matchHeaders = ["H1" <:> "5", "H2" <:> "kilroy"]
, matchStatus = expected
}
it "responds with not found for non-existent endpoints" $
forM_ methods $ \(method,_) ->
Test.Hspec.Wai.request method "blahblah" [] ""
`shouldRespondWith` 404
it "returns 415 if the Accept header is not supported" $
forM_ methods $ \(method,_) ->
Test.Hspec.Wai.request method "" [(hAccept, "crazy/mime")] ""
`shouldRespondWith` 415
type PrioErrorsApi = ReqBody '[JSON] Person :> "foo" :> Get '[JSON] Integer
prioErrorsApi :: Proxy PrioErrorsApi
prioErrorsApi = Proxy
-- | Test the relative priority of error responses from the server.
--
-- In particular, we check whether matching continues even if a 'ReqBody'
-- or similar construct is encountered early in a path. We don't want to
-- see a complaint about the request body unless the path actually matches.
--
prioErrorsSpec :: Spec
prioErrorsSpec = describe "PrioErrors" $ do
let server = return . age
with (return $ serve prioErrorsApi server) $ do
let check (mdescr, method) path (cdescr, ctype, body) resp =
it fulldescr $
Test.Hspec.Wai.request method path [(hContentType, ctype)] body
`shouldRespondWith` resp
where
fulldescr = "returns " ++ show (matchStatus resp) ++ " on " ++ mdescr
++ " " ++ cs path ++ " (" ++ cdescr ++ ")"
get' = ("GET", methodGet)
put' = ("PUT", methodPut)
txt = ("text" , "text/plain;charset=utf8" , "42" )
ijson = ("invalid json", "application/json;charset=utf8", "invalid" )
vjson = ("valid json" , "application/json;charset=utf8", encode alice)
check get' "/" txt 404
check get' "/bar" txt 404
check get' "/foo" txt 415
check put' "/" txt 404
check put' "/bar" txt 404
check put' "/foo" txt 405
check get' "/" ijson 404
check get' "/bar" ijson 404
check get' "/foo" ijson 400
check put' "/" ijson 404
check put' "/bar" ijson 404
check put' "/foo" ijson 405
check get' "/" vjson 404
check get' "/bar" vjson 404
check get' "/foo" vjson 200
check put' "/" vjson 404
check put' "/bar" vjson 404
check put' "/foo" vjson 405
-- | Test server error functionality.
errorsSpec :: Spec
errorsSpec = do
let he = HttpError status409 (Just "A custom error")
let ib = InvalidBody "The body is invalid"
let wm = WrongMethod
let nf = NotFound
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describe "Servant.Server.Internal.RouteMismatch" $ do
it "HttpError > *" $ do
ib <> he `shouldBe` he
wm <> he `shouldBe` he
nf <> he `shouldBe` he
he <> ib `shouldBe` he
he <> wm `shouldBe` he
he <> nf `shouldBe` he
it "HE > InvalidBody > (WM,NF)" $ do
he <> ib `shouldBe` he
wm <> ib `shouldBe` ib
nf <> ib `shouldBe` ib
ib <> he `shouldBe` he
ib <> wm `shouldBe` ib
ib <> nf `shouldBe` ib
it "HE > IB > WrongMethod > NF" $ do
he <> wm `shouldBe` he
ib <> wm `shouldBe` ib
nf <> wm `shouldBe` wm
wm <> he `shouldBe` he
wm <> ib `shouldBe` ib
wm <> nf `shouldBe` wm
it "* > NotFound" $ do
he <> nf `shouldBe` he
ib <> nf `shouldBe` ib
wm <> nf `shouldBe` wm
nf <> he `shouldBe` he
nf <> ib `shouldBe` ib
nf <> wm `shouldBe` wm