Skip unknown fields

tests/Language/GraphQL/ExecuteSpec.hs

@@ -0,0 +1,42 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Language.GraphQL.ExecuteSpec
+    ( spec
+    ) where
+
+import Data.Aeson ((.=))
+import qualified Data.Aeson as Aeson
+import Data.Functor.Identity (Identity(..))
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as HashMap
+import Language.GraphQL.AST (Name)
+import Language.GraphQL.AST.Parser (document)
+import Language.GraphQL.Error
+import Language.GraphQL.Execute
+import Language.GraphQL.Type
+import Language.GraphQL.Type.Out as Out
+import Test.Hspec (Spec, describe, it, shouldBe)
+import Text.Megaparsec (parse)
+
+schema :: Schema Identity
+schema = Schema {query = queryType, mutation = Nothing}
+
+queryType :: Out.ObjectType Identity
+queryType = Out.ObjectType "Query" Nothing []
+    $ HashMap.singleton "count"
+    $ Out.Resolver countField
+    $ pure
+    $ Int 8
+  where
+    countField = Out.Field Nothing (Out.NonNullScalarType int) HashMap.empty
+
+spec :: Spec
+spec =
+    describe "execute" $
+        it "skips unknown fields" $
+            let expected = Aeson.object
+                    ["data" .= Aeson.object ["count" .= (8 :: Int)]]
+                execute' = execute schema (mempty :: HashMap Name Aeson.Value)
+                actual = runIdentity
+                    $ either parseError execute'
+                    $ parse document "" "{ count number }"
+             in actual `shouldBe` expected