From 7004515f06024227f3e6068150fc5d275b0c4392 Mon Sep 17 00:00:00 2001
From: Alec Rosenbaum <alec.rosenbaum@close.io>
Date: Fri, 15 Jan 2021 13:13:05 -0500
Subject: [PATCH] implement interface interfaces on TypeMap, fix failing test

---
 graphene/types/schema.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/graphene/types/schema.py b/graphene/types/schema.py
index 4fd71769..8f27c9b9 100644
--- a/graphene/types/schema.py
+++ b/graphene/types/schema.py
@@ -236,11 +236,20 @@ class TypeMap(dict):
             else None
         )
 
+        def interfaces():
+            interfaces = []
+            for graphene_interface in graphene_type._meta.interfaces:
+                interface = self.add_type(graphene_interface)
+                assert interface.graphene_type == graphene_interface
+                interfaces.append(interface)
+            return interfaces
+
         return GrapheneInterfaceType(
             graphene_type=graphene_type,
             name=graphene_type._meta.name,
             description=graphene_type._meta.description,
             fields=partial(self.create_fields_for_type, graphene_type),
+            interfaces=interfaces,
             resolve_type=resolve_type,
         )