Add testcase

graphene/tests/issues/test_719.py

@@ -0,0 +1,45 @@
+# https://github.com/graphql-python/graphene/issues/719
+
+import graphene
+
+
+class InvitationType(graphene.ObjectType):
+    creation_date = graphene.String()
+
+
+class CreateInvitation(graphene.Mutation):
+    class Arguments:
+        email = graphene.String(required=True)
+
+    invitation = graphene.Field(InvitationType)
+
+    def mutate(self, info, email):
+        return InvitationType(creation_date='2018-05-04T14:45:36')
+
+
+class Mutations(graphene.ObjectType):
+    create_invitation = CreateInvitation.Field()
+
+
+class Query(graphene.ObjectType):
+    name = graphene.String(default_value="Dave")
+
+
+def test_issue():
+    query_string = '''
+        mutation ($email: String!) {
+           createInvitation(email: $email) {
+               invitation {
+                   creationDate
+              }
+           }
+        }
+    '''
+
+    schema = graphene.Schema(query=Query, mutation=Mutations)
+    result = schema.execute(query_string, variable_values={
+        'email': 'foo@bar.com',
+    })
+
+    assert not result.errors
+    # assert result.data['someField'] == 'Oh'