Test fixtures for Schema toplevel

This includes simplications to the Schema data types.

tests/Test/StarWars.hs

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+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE RecordWildCards #-}
+module Test.StarWars where
+
+import Data.Text (Text)
+import Data.HashMap.Lazy (HashMap)
+import Data.GraphQL.Schema
+
+type ID = Text
+
+schema :: Applicative f => Schema f
+schema = Schema query Nothing
+
+query :: Applicative f => QueryRoot f
+query = [ ("hero", hero)
+        , ("human", human)
+        , ("droid", droid)
+        ]
+
+hero :: Applicative f => Input -> f Output
+hero (InputScalar (ScalarInt ep)) = OutputObject <$> getHeroF ep
+hero _ = pure InputError
+
+human :: Applicative f => Input -> f Output
+human (InputScalar (ScalarString id_)) = OutputScalar . ScalarString <$> getHumanF id_
+human _ = pure InputError
+
+droid :: Applicative f => Input -> f Output
+droid (InputScalar (ScalarString id_)) = OutputScalar . ScalarString <$> getDroidF id_
+droid _ = pure InputError
+
+-- * Data
+
+-- ** Characters
+
+
+data Character = Character
+  { id_ :: ID
+  , name :: Text
+  , friends :: [ID]
+  , appearsIn :: [Int]
+  , homePlanet :: Text
+  }
+
+luke :: Character
+luke = Character
+  { id_ = "1000"
+  , name = "Luke Skywalker"
+  , friends = ["1002","1003","2000","2001"]
+  , appearsIn = [4,5,6]
+  , homePlanet = "Tatoonie"
+  }
+
+artoo :: Character
+artoo = Character
+  { id_ = "2001"
+  , name = "R2-D2"
+  , friends = ["1000","1002","1003"]
+  , appearsIn = [4,5,6]
+  , homePlanet = "Astrometch"
+  }
+
+type CharacterObject = HashMap Text Output
+
+character :: Character -> CharacterObject
+character (Character{..}) =
+  [ ("id_", OutputScalar $ ScalarID id_)
+  , ("name", OutputScalar $ ScalarString name)
+  , ("friends", OutputList $ OutputScalar . ScalarID <$> friends)
+  , ("appearsIn", OutputList $ OutputScalar . ScalarInt <$> appearsIn)
+  , ("homePlanet", OutputScalar $ ScalarString homePlanet)
+  ]
+
+-- ** Hero
+
+getHero :: Int -> CharacterObject
+getHero 5 = character luke
+getHero _ = character artoo
+
+getHeroF :: Applicative f => Int -> f CharacterObject
+getHeroF = pure . getHero
+
+-- ** Human
+
+getHuman :: ID -> Text
+getHuman "1000" = "luke"
+getHuman "1001" = "vader"
+getHuman "1002" = "han"
+getHuman "1003" = "leia"
+getHuman "1004" = "tarkin"
+getHuman _      = ""
+
+getHumanF :: Applicative f => ID -> f Text
+getHumanF = pure . getHuman
+
+getHumanIO :: ID -> IO Text
+getHumanIO = getHumanF
+
+-- ** Droid
+
+getDroid :: ID -> Text
+getDroid "2000" = "threepio"
+getDroid "2001" = "artoo"
+getDroid _ = ""
+
+getDroidF :: Applicative f => ID -> f Text
+getDroidF = pure . getDroid
+
+getDroidIO :: ID -> IO Text
+getDroidIO = getDroidF