added test for specifiedBy resolver

Author: Code-Hex

internal/gqlgen/gqlgen_test.yml

@@ -304,4 +304,44 @@ tests:
               {"isRepeatable":false,"name":"skip"},
               {"isRepeatable":false,"name":"specifiedBy"}
             ]}
+        }
+
+    - name: querying for specifiedBy
+      schema: |
+        scalar UUID @specifiedBy(url: "https://tools.ietf.org/html/rfc4122")
+
+        type Query {
+          id: ID
+          uuid: UUID
+        }
+      query: |
+        {
+          __schema {
+            types {
+              name
+              specifiedBy
+            }
+          }
+        }
+      json: |
+        {"__schema":
+          {
+            "types":[
+              {"name":"Boolean","specifiedBy":null},
+              {"name":"Float","specifiedBy":null},
+              {"name":"ID","specifiedBy":null},
+              {"name":"Int","specifiedBy":null},
+              {"name":"Query","specifiedBy":null},
+              {"name":"String","specifiedBy":null},
+              {"name":"UUID","specifiedBy":"https://tools.ietf.org/html/rfc4122"},
+              {"name":"__Directive","specifiedBy":null},
+              {"name":"__DirectiveLocation","specifiedBy":null},
+              {"name":"__EnumValue","specifiedBy":null},
+              {"name":"__Field","specifiedBy":null},
+              {"name":"__InputValue","specifiedBy":null},
+              {"name":"__Schema","specifiedBy":null},
+              {"name":"__Type","specifiedBy":null},
+              {"name":"__TypeKind","specifiedBy":null}
+            ]
+          }
         }