Fix failing tests on middleware pipeline

Author: samwelkanda

tests/unit/test_middleware_pipeline.py

@@ -22,6 +22,7 @@ def test_request_object_is_modified_in_order(self):
         middleware_pipeline.add_middleware(MockRequestMiddleware2())
 
         request = OrderedDict()
+        request.headers = {}
         result = middleware_pipeline.send(request=request)
 
         second, _ = result.popitem()
@@ -41,7 +42,9 @@ def test_response_object_is_modified_in_reverse_order(self):
 
         # Responses are passed through the list of middlewares in reverse order.
         # This will return hello world
-        resp = middleware_pipeline.send(OrderedDict())
+        request = OrderedDict()
+        request.headers = {}
+        resp = middleware_pipeline.send(request)
 
         self.assertEqual(resp, 'Hello World')