diff --git a/graphene/test/__init__.py b/graphene/test/__init__.py
index 6d46bd57..a613d905 100644
--- a/graphene/test/__init__.py
+++ b/graphene/test/__init__.py
@@ -18,7 +18,9 @@ def format_execution_result(execution_result, format_error):
         response = {}
 
         if execution_result.errors:
-            response['errors'] = [format_error(e) for e in execution_result.errors]
+            response['errors'] = [
+                format_error(e) for e in execution_result.errors
+            ]
 
         if not execution_result.invalid:
             response['data'] = execution_result.data
@@ -32,16 +34,14 @@ class Client(object):
         self.schema = schema
         self.execute_options = execute_options
         self.format_error = format_error or default_format_error
-    
+
     def format_result(self, result):
-        return format_execution_result(
-            result,
-            self.format_error
-        )
+        return format_execution_result(result, self.format_error)
 
     def execute(self, *args, **kwargs):
-        executed = self.schema.execute(*args, **dict(self.execute_options, **kwargs))
+        executed = self.schema.execute(*args,
+                                       **dict(self.execute_options, **kwargs))
         if is_thenable(executed):
             return Promise.resolve(executed).then(self.format_result)
-        
+
         return self.format_result(executed)