diff --git a/tests/test_dispatcher.py b/tests/test_dispatcher.py
index bffb790..75b3f64 100644
--- a/tests/test_dispatcher.py
+++ b/tests/test_dispatcher.py
@@ -24,4 +24,14 @@ class TestDispatcher(unittest.TestCase):
         self.assertEqual(result, 'value')
 
     def test_sub(self):
-        pass
\ No newline at end of file
+        dispatcher = Dispatcher()
+        params ={'param': 'value'}
+
+        sub = Dispatcher()
+        sub.register('name', comparator, action)
+
+        dispatcher.register('name', comparator, sub)
+        method = dispatcher(params)
+        result = method(params)
+        sub_result = result(params)
+        self.assertEqual(sub_result, 'value')