Remove duplicate NonNull test

Replicates graphql/graphql-js@948c9cf

Author: Cito

README.md

@@ -13,7 +13,7 @@ a query language for APIs created by Facebook.
 [![Code Style](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)
 
 The current version 1.0.2 of GraphQL-core-next is up-to-date with GraphQL.js version
-14.1.1. All parts of the API are covered by an extensive test suite of currently 1727
+14.1.1. All parts of the API are covered by an extensive test suite of currently 1726
 unit tests.
 
 

tests/type/test_definition.py

@@ -111,15 +111,6 @@ def stringifies_simple_types():
         assert str(ListOfNonNullScalarsType) == "[Scalar!]"
         assert str(GraphQLList(ListOfScalarsType)) == "[[Scalar]]"
 
-    def prohibits_nesting_nonnull_inside_nonnull():
-        with raises(TypeError) as exc_info:
-            # noinspection PyTypeChecker
-            GraphQLNonNull(GraphQLNonNull(NonNullScalarType))
-        msg = str(exc_info.value)
-        assert msg == (
-            "Can only create NonNull of a Nullable GraphQLType but got: Scalar!."
-        )
-
     def allows_a_thunk_for_union_member_types():
         union = GraphQLUnionType("ThunkUnion", lambda: [ObjectType])