diff --git a/tests/cores/mega/test_microservice.py b/tests/cores/mega/test_microservice.py
index 538039849..212f5d79a 100644
--- a/tests/cores/mega/test_microservice.py
+++ b/tests/cores/mega/test_microservice.py
@@ -48,7 +48,9 @@ def test_add_route(self):
 
     def test_health(self):
         response = self.client.get("/v1/health_check")
-        self.assertEqual(response.json(), {'Service Title': 's1', 'Service Description': 'OPEA Microservice Infrastructure'})
+        self.assertEqual(
+            response.json(), {"Service Title": "s1", "Service Description": "OPEA Microservice Infrastructure"}
+        )
 
     def test_conflict_port(self):
         self.assertRaises(RuntimeError, MicroService, name="s2", host="0.0.0.0", port=8080, endpoint="/v1/add")