added test for returning promise

graphene/relay/tests/test_query.py

@@ -51,6 +51,9 @@ class Query(graphene.ObjectType):
 
     connection_type_nodes = relay.ConnectionField(
         MyNode, connection_type=MyConnection)
+    
+    promise_connection_type = relay.ConnectionField(
+        MyNode, connection_type=MyConnection)
 
     all_my_objects = relay.ConnectionField(
         MyObject, connection_type=MyConnection)
@@ -75,6 +78,9 @@ class Query(graphene.ObjectType):
 
     def resolve_all_my_objects(self, args, info):
         return [MyObject(name='my_object')]
+    
+    def resolve_promise_connection_type(self, args, info):
+        return Promise.resolve('async name').then(lambda name: [MyNode(id='1', name=name)])
 
 schema.query = Query
 
@@ -228,6 +234,32 @@ def test_connectionfield_resolve_returning_objects():
     assert result.data == expected
 
 
+def test_connectionfield_resolve_returning_promise():
+    query = '''
+    query RebelsShipsQuery {
+      promiseConnectionType {
+        edges {
+          node {
+            name
+          }
+        }
+      }
+    }
+    '''
+    expected = {
+        'promiseConnectionType': {
+            'edges': [{
+                'node': {
+                    'name': 'async name'
+                }
+            }]
+        }
+    }
+    result = schema.execute(query)
+    assert not result.errors
+    assert result.data == expected
+
+
 @pytest.mark.parametrize('specialness,value', [(True, '!!!'), (False, '???')])
 def test_get_node_info(specialness, value):
     query = '''