1 files changed, 113 insertions, 1 deletions
diff --git a/tests/Language/GraphQL/ValidateSpec.hs b/tests/Language/GraphQL/ValidateSpec.hs
index f84322d..8f6626b 100644
--- a/tests/Language/GraphQL/ValidateSpec.hs
+++ b/tests/Language/GraphQL/ValidateSpec.hs
@@ -148,7 +148,7 @@ validate queryString =
 
 spec :: Spec
 spec =
-    describe "document" $
+    describe "document" $ do
         it "rejects type definitions" $
             let queryString = [r|
               query getDogName {
@@ -169,3 +169,115 @@ spec =
                     , path = []
                     }
              in validate queryString `shouldBe` Seq.singleton expected
+
+        it "rejects multiple subscription root fields" $
+            let queryString = [r|
+              subscription sub {
+                newMessage {
+                  body
+                  sender
+                }
+                disallowedSecondRootField
+              }
+            |]
+                expected = Error
+                    { message =
+                        "Subscription sub must select only one top level field."
+                    , locations = [AST.Location 2 15]
+                    , path = []
+                    }
+             in validate queryString `shouldBe` Seq.singleton expected
+
+        it "rejects multiple subscription root fields coming from a fragment" $
+            let queryString = [r|
+              subscription sub {
+                ...multipleSubscriptions
+              }
+
+              fragment multipleSubscriptions on Subscription {
+                newMessage {
+                  body
+                  sender
+                }
+                disallowedSecondRootField
+              }
+            |]
+                expected = Error
+                    { message =
+                        "Subscription sub must select only one top level field."
+                    , locations = [AST.Location 2 15]
+                    , path = []
+                    }
+             in validate queryString `shouldBe` Seq.singleton expected
+
+        it "rejects multiple anonymous operations" $
+            let queryString = [r|
+              {
+                dog {
+                  name
+                }
+              }
+
+              query getName {
+                dog {
+                  owner {
+                    name
+                  }
+                }
+              }
+            |]
+                expected = Error
+                    { message =
+                        "This anonymous operation must be the only defined operation."
+                    , locations = [AST.Location 2 15]
+                    , path = []
+                    }
+             in validate queryString `shouldBe` Seq.singleton expected
+
+        it "rejects operations with the same name" $
+            let queryString = [r|
+              query dogOperation {
+                dog {
+                  name
+                }
+              }
+
+              mutation dogOperation {
+                mutateDog {
+                  id
+                }
+            }
+            |]
+                expected = Error
+                    { message =
+                        "There can be only one operation named \"dogOperation\"."
+                    , locations = [AST.Location 2 15, AST.Location 8 15]
+                    , path = []
+                    }
+             in validate queryString `shouldBe` Seq.singleton expected
+
+        it "rejects fragments with the same name" $
+            let queryString = [r|
+              {
+                dog {
+                  ...fragmentOne
+                }
+              }
+
+              fragment fragmentOne on Dog {
+                name
+              }
+
+              fragment fragmentOne on Dog {
+                owner {
+                  name
+                }
+              }
+            |]
+                expected = Error
+                    { message =
+                        "There can be only one fragment named \"fragmentOne\"."
+                    , locations = [AST.Location 8 15, AST.Location 12 15]
+                    , path = []
+                    }
+             in validate queryString `shouldBe` Seq.singleton expected