buildClientSchema: Throws when missing directive locations

Replicates graphql/graphql-js@c8a5792

Author: Cito

README.md

@@ -12,8 +12,8 @@ a query language for APIs created by Facebook.
 [![Python 3 Status](https://pyup.io/repos/github/graphql-python/graphql-core-next/python-3-shield.svg)](https://pyup.io/repos/github/graphql-python/graphql-core-next/)
 
 The current version 1.0.0 of GraphQL-core-next is up-to-date with GraphQL.js
-version 14.0.0. All parts of the API are covered by an extensive test suite of
-currently 1603 unit tests.
+version 14.0.1. All parts of the API are covered by an extensive test suite of
+currently 1604 unit tests.
 
 
 ## Documentation

graphql/__init__.py

@@ -38,7 +38,7 @@
 """
 
 __version__ = '1.0.0'
-__version_js__ = '14.0.0'
+__version_js__ = '14.0.1'
 
 # The primary entry point into fulfilling a GraphQL request.
 

graphql/utilities/build_client_schema.py

@@ -238,6 +238,10 @@ def build_directive(directive_introspection: Dict) -> GraphQLDirective:
             raise TypeError(
                 'Introspection result missing directive args:'
                 f' {directive_introspection!r}')
+        if directive_introspection.get('locations') is None:
+            raise TypeError(
+                'Introspection result missing directive locations:'
+                f' {directive_introspection!r}')
         return GraphQLDirective(
             name=directive_introspection['name'],
             description=directive_introspection.get('description'),

tests/utilities/test_build_client_schema.py

@@ -388,6 +388,21 @@ def throws_when_missing_interfaces():
             " 'type': {'kind': 'SCALAR', 'name': 'String', 'ofType': None},"
             " 'isDeprecated': False}]}")
 
+    def throws_when_missing_directive_locations():
+        introspection = {
+            '__schema': {
+                'types': [],
+                'directives': [{'name': 'test', 'args': []}]
+            }
+        }
+
+        with raises(TypeError) as exc_info:
+            build_client_schema(introspection)
+
+        assert str(exc_info.value) == (
+            'Introspection result missing directive locations:'
+            " {'name': 'test', 'args': []}")
+
 
 def describe_very_deep_decorators_are_not_supported():