Add singleError utility functionv0.4.0.0

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/Language/GraphQL/ErrorSpec.hs b/tests/Language/GraphQL/ErrorSpec.hs
new file mode 100644
index 0000000..8bb39ed
--- /dev/null
+++ b/tests/Language/GraphQL/ErrorSpec.hs
@@ -0,0 +1,24 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Language.GraphQL.ErrorSpec
+    ( spec
+    ) where
+
+import qualified Data.Aeson as Aeson
+import Language.GraphQL.Error
+import Test.Hspec ( Spec
+                  , describe
+                  , it
+                  , shouldBe
+                  )
+
+spec :: Spec
+spec = describe "singleError" $
+    it "constructs an error with the given message" $
+        let expected = Aeson.object
+                [
+                    ("errors", Aeson.toJSON
+                        [ Aeson.object [("message", "Message.")]
+                        ]
+                    )
+                ]
+         in singleError "Message." `shouldBe` expected