diff --git a/aiohttp/test_utils.py b/aiohttp/test_utils.py
index fdc63ee9c4d..ea7b858c725 100644
--- a/aiohttp/test_utils.py
+++ b/aiohttp/test_utils.py
@@ -448,7 +448,17 @@ def teardown_test_loop(loop, fast=False):
 
 
 def _create_app_mock():
-    app = mock.Mock()
+    def get_dict(app, key):
+        return app.__app_dict[key]
+
+    def set_dict(app, key, value):
+        app.__app_dict[key] = value
+
+    app = mock.MagicMock()
+    app.__app_dict = {}
+    app.__getitem__ = get_dict
+    app.__setitem__ = set_dict
+
     app._debug = False
     app.on_response_prepare = Signal(app)
     app.on_response_prepare.freeze()
diff --git a/tests/test_test_utils.py b/tests/test_test_utils.py
index a45e7cab753..1d45aad7cbf 100644
--- a/tests/test_test_utils.py
+++ b/tests/test_test_utils.py
@@ -189,6 +189,12 @@ def test_make_mocked_request_app():
     assert req.app is app
 
 
+def test_make_mocked_request_app_can_store_values():
+    req = make_mocked_request('GET', '/')
+    req.app['a_field'] = 'a_value'
+    assert req.app['a_field'] == 'a_value'
+
+
 def test_make_mocked_request_match_info():
     req = make_mocked_request('GET', '/', match_info={'a': '1', 'b': '2'})
     assert req.match_info == {'a': '1', 'b': '2'}