forked from OSS/graphql
132 lines
3.6 KiB
Haskell
132 lines
3.6 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedLists #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Test.StarWars where
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#if !MIN_VERSION_base(4,8,0)
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import Control.Applicative (Applicative, (<$>), pure)
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import Data.Traversable (traverse)
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#endif
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import Control.Applicative (Alternative, (<|>), empty, liftA2)
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import Data.Maybe (catMaybes)
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import qualified Data.Aeson as Aeson
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import Data.Text (Text)
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import Test.Tasty (TestTree, testGroup)
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import Test.Tasty.HUnit (testCase, (@?=))
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import Data.GraphQL
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import Data.GraphQL.Schema
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-- * Test
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsQueryTests.js
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test :: TestTree
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test = testGroup "Basic Queries"
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[testCase "R2-D2"
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$ graphql schema "query HeroNameQuery{hero{name}}"
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@?= Just (Aeson.Object [("hero", Aeson.Object [("name", "R2-D2")])])
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]
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-- * Schema
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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type ID = Text
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schema :: Alternative f => Schema f
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schema = Schema query
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query :: Alternative f => QueryRoot f
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query (InputField "hero") = pure $ OutputResolver hero
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query (InputField "human") = pure $ OutputResolver human
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query (InputField "droid") = pure $ OutputResolver droid
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query _ = empty
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hero :: Alternative f => Resolver f
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hero (InputList (InputScalar (ScalarInt ep) : inputFields)) =
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withFields inputFields <$> getHero ep
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hero (InputField fld) = characterOutput fld artoo
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hero _ = empty
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human :: Alternative f => Resolver f
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human (InputList (InputScalar (ScalarID i) : inputFields)) =
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withFields inputFields <$> getHuman i
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human _ = empty
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droid :: Alternative f => Resolver f
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droid (InputList (InputScalar (ScalarID i) : inputFields)) =
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withFields inputFields <$> getDroid i
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droid _ = empty
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characterOutput :: Alternative f => Text -> Character -> f (Output f)
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characterOutput "id" char =
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pure $ OutputScalar . pure . ScalarString $ id_ char
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characterOutput "name" char =
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pure $ OutputScalar . pure . ScalarString $ name char
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characterOutput "friends" char =
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-- TODO: Cleanup
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pure . OutputList . pure $ OutputResolver . (\c (InputField f) ->
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characterOutput f c) <$> getFriends char
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characterOutput _ _ = empty
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withFields :: Alternative f => [Input] -> Character -> Output f
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withFields inputFields char =
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OutputList . traverse (`characterOutput` char) $ fields inputFields
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-- * Data
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsData.js
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-- ** Characters
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data Character = Character
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{ id_ :: ID
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, name :: Text
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, friends :: [ID]
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, appearsIn :: [Int]
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, homePlanet :: Text
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} deriving (Show)
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luke :: Character
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luke = Character
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{ id_ = "1000"
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, name = "Luke Skywalker"
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, friends = ["1002","1003","2000","2001"]
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, appearsIn = [4,5,6]
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, homePlanet = "Tatoonie"
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}
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artoo :: Character
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artoo = Character
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{ id_ = "2001"
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, name = "R2-D2"
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, friends = ["1000","1002","1003"]
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, appearsIn = [4,5,6]
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, homePlanet = "Astrometch"
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}
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-- ** Helper functions
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getHero :: Applicative f => Int -> f Character
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getHero 5 = pure luke
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getHero _ = pure artoo
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getHeroIO :: Int -> IO Character
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getHeroIO = getHero
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getHuman :: Alternative f => ID -> f Character
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getHuman "1000" = pure luke
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-- getHuman "1001" = "vader"
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-- getHuman "1002" = "han"
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-- getHuman "1003" = "leia"
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-- getHuman "1004" = "tarkin"
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getHuman _ = empty
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getDroid :: Alternative f => ID -> f Character
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-- getDroid "2000" = "threepio"
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getDroid "2001" = pure artoo
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getDroid _ = empty
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getFriends :: Character -> [Character]
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getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
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