diff --git a/tests/cores/mega/test_microservice.py b/tests/cores/mega/test_microservice.py
index 0b8b9c7f2..4a3afba5a 100644
--- a/tests/cores/mega/test_microservice.py
+++ b/tests/cores/mega/test_microservice.py
@@ -7,7 +7,7 @@
 
 from fastapi.testclient import TestClient
 
-from comps import TextDoc, opea_microservices, register_microservice
+from comps import TextDoc, opea_microservices, register_microservice, MicroService
 
 
 @register_microservice(name="s1", host="0.0.0.0", port=8080, endpoint="/v1/add")
@@ -18,15 +18,21 @@ async def add(request: TextDoc) -> TextDoc:
     text += "OPEA Project!"
     return {"text": text}
 
+def sum_test():
+    return 1 + 1
 
 class TestMicroService(unittest.TestCase):
     def setUp(self):
         self.client = TestClient(opea_microservices["s1"].app)
 
+        opea_microservices["s1"].add_route("/v1/sum", sum_test, methods=["GET"])
         self.process1 = multiprocessing.Process(target=opea_microservices["s1"].start, daemon=False, name="s1")
 
         self.process1.start()
 
+        # test conflict port
+        self.assertRaises(RuntimeError, MicroService, name="s2", host="0.0.0.0", port=8080, endpoint="/v1/add")
+
     def tearDown(self):
         opea_microservices["s1"].stop()
         self.process1.terminate()
@@ -38,6 +44,9 @@ def test_add_route(self):
         response = self.client.get("/metrics")
         self.assertEqual(response.status_code, 200)
 
+        response = self.client.get("/v1/sum")
+        self.assertEqual(response.json(), 2)
+
 
 if __name__ == "__main__":
     unittest.main()