Fixed subscription tests in Py2

Author: syrusakbary

graphql/execution/tests/test_subscribe.py

@@ -44,9 +44,20 @@
 )
 
 
+def get_unbound_function(func):
+ if not getattr(func, '__self__', True):
+ return func.__func__
+ return func
+
+
 def email_schema_with_resolvers(resolve_fn=None):
  def default_resolver(root, info):
- return getattr(root, 'importantEmail', Observable.empty)()
+ func = getattr(root, 'importantEmail', None)
+ if func:
+ func = get_unbound_function(func)
+ return func()
+ return Observable.empty()
+
  return GraphQLSchema(
  query=QueryType,
  subscription=GraphQLObjectType(
@@ -76,8 +87,8 @@ def on_completed(self):
 
 
 def create_subscription(stream, schema=email_schema, ast=None, vars=None):
- class Root:
- class inbox:
+ class Root(object):
+ class inbox(object):
  emails = [
  Email(
  from_='joe@graphql.org',