forked from OSS/graphql
129 lines
3.6 KiB
Haskell
129 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 ((<$>))
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#endif
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import Control.Applicative ((<|>), liftA2)
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import Data.Maybe (catMaybes)
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import Data.Text (Text)
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import qualified Data.Aeson as Aeson
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import Data.Attoparsec.Text (parseOnly)
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import Test.Tasty (TestTree)
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import Test.Tasty.HUnit
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import Data.GraphQL.AST
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import Data.GraphQL.Execute
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import qualified Data.GraphQL.Parser as Parser
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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 = testCase "R2-D2" $ execute schema heroQuery @?= expected
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where
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heroQuery :: Document
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heroQuery = either (error "Parsing error") id $ parseOnly Parser.document
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"query HeroNameQuery{hero{name}}"
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expected :: Maybe Response
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expected = Just $ Aeson.Object [("hero", Aeson.Object [("name", "R2-D2")])]
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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 :: Schema
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schema = Schema query
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query :: QueryRoot
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query (InputField "hero") = OutputResolver hero
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query (InputField "human") = OutputResolver human
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query (InputField "droid") = OutputResolver droid
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query _ = OutputError
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-- TODO: Extract helper function from next 3 functions.
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hero :: Resolver
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hero (InputList (InputScalar (ScalarInt ep) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getHero ep
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hero (InputField fld) = characterOutput fld artoo
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hero _ = OutputError
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human :: Resolver
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human (InputList (InputScalar (ScalarID i) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getHuman i
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human _ = OutputError
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droid :: Resolver
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droid (InputList (InputScalar (ScalarID i) : inputFields)) =
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maybe OutputError (\char -> OutputList $ (`characterOutput` char) <$> fields inputFields) $ getDroid i
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droid _ = OutputError
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characterOutput :: Text -> Character -> Output
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characterOutput "id" char = OutputScalar . ScalarString $ id_ char
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characterOutput "name" char = OutputScalar . ScalarString $ name char
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characterOutput "friends" char = OutputList $ OutputResolver . (\c (InputField f) -> characterOutput f c) <$> getFriends char
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characterOutput _ _ = OutputError
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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 :: Int -> Maybe Character
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getHero 5 = Just luke
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getHero _ = Just artoo
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getHuman :: ID -> Maybe Character
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getHuman "1000" = Just 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 _ = Nothing
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getDroid :: ID -> Maybe Character
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-- getDroid "2000" = "threepio"
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getDroid "2001" = Just artoo
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getDroid _ = Nothing
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getFriends :: Character -> [Character]
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getFriends char = catMaybes $ liftA2 (<|>) getDroid getHuman <$> friends char
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