diff --git a/graphene/relay/tests/test_query.py b/graphene/relay/tests/test_query.py
index c598ab9e..af6e188a 100644
--- a/graphene/relay/tests/test_query.py
+++ b/graphene/relay/tests/test_query.py
@@ -4,6 +4,8 @@ from graphql.type import GraphQLID, GraphQLNonNull
 import graphene
 from graphene import relay, with_context
 
+from promise import Promise
+
 schema = graphene.Schema()
 
 
@@ -51,7 +53,7 @@ class Query(graphene.ObjectType):
 
     connection_type_nodes = relay.ConnectionField(
         MyNode, connection_type=MyConnection)
-    
+
     promise_connection_type = relay.ConnectionField(
         MyNode, connection_type=MyConnection)
 
@@ -78,7 +80,7 @@ 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)])
 
diff --git a/setup.py b/setup.py
index 27246df5..8f1016a4 100644
--- a/setup.py
+++ b/setup.py
@@ -66,6 +66,7 @@ setup(
         'sqlalchemy',
         'sqlalchemy_utils',
         'mock',
+        'promse',
         # Required for Django postgres fields testing
         'psycopg2',
     ],
diff --git a/tox.ini b/tox.ini
index 05b37dfd..255e3959 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,6 +14,7 @@ deps=
     blinker
     singledispatch
     mock
+    promise
 setenv =
      PYTHONPATH = .:{envdir}
 commands=