diff --git a/tests_unit/test__init__.py b/tests_unit/test__init__.py
index 67bed83..5bc8e1d 100644
--- a/tests_unit/test__init__.py
+++ b/tests_unit/test__init__.py
@@ -1,3 +1,5 @@
+import asyncio
+import typing
 from unittest import IsolatedAsyncioTestCase
 from unittest.mock import Mock, AsyncMock, patch, call
 
@@ -79,6 +81,22 @@ async def test_should_call_route_when_adding_callback_endpoint(self):
         )
         self.decorator.assert_called_once()
 
+    async def test_hook_to_callback_should_be_async_and_typed(self):
+        bd = BarterDude()
+        bd.add_endpoint = Mock()
+        bd._call_callback_endpoint = Mock()
+
+        hook = Mock()
+        bd.add_callback_endpoint(
+            ['/my_route'],
+            hook,
+            [(Mock(), 'service')]
+        )
+
+        internal_hook = bd.add_endpoint.call_args_list[0][1].get('hook')
+        assert asyncio.iscoroutinefunction(internal_hook) is True
+        assert 'req' in typing.get_type_hints(internal_hook)
+
     async def test_should_hook_call_on_callback_endpoint(self):
         async def mock_hook(message, barterdude):
             barterdude['service'].method_one()