Fix message test

spec/graphql/enum_type_spec.rb

@@ -113,13 +113,13 @@
 
   describe "validates enum value name uniqueness" do
     it "raises an exception when adding a duplicate enum value name" do
-      expected_message = "Enum value names must be unique. Value `COW` already exists on Enum `DairyAnimalEnum`."
+      expected_message = "Enum value names must be unique. Value `COW` already exists on Enum `DairyAnimal`."
 
       exception = assert_raises do
         enum.add_value(GraphQL::EnumType::EnumValue.define(name: "COW"))
       end
 
-      assert_equal(expected_message, expected_message)
+      assert_equal(expected_message, exception.message)
     end
   end
 end