diff --git a/rust/py_test/test_launch_server.py b/rust/py_test/test_launch_server.py
index a7a695aa9f6..13fcc8f4e4c 100644
--- a/rust/py_test/test_launch_server.py
+++ b/rust/py_test/test_launch_server.py
@@ -1,3 +1,4 @@
+import socket
 import subprocess
 import time
 import unittest
@@ -49,7 +50,49 @@ def popen_launch_router(
     # Use current environment
     env = None
 
-    process = subprocess.Popen(command, stdout=None, stderr=None, env=env)
+    process = subprocess.Popen(command, stdout=None, stderr=None)
+
+    start_time = time.time()
+    with requests.Session() as session:
+        while time.time() - start_time < timeout:
+            try:
+                response = session.get(f"{base_url}/health")
+                if response.status_code == 200:
+                    return process
+            except requests.RequestException:
+                pass
+            time.sleep(10)
+
+    raise TimeoutError("Router failed to start within the timeout period.")
+
+
+def find_available_port():
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.bind(("", 0))
+        return s.getsockname()[1]
+
+
+def popen_launch_server(
+    model: str,
+    base_url: str,
+    timeout: float,
+):
+    _, host, port = base_url.split(":")
+    host = host[2:]
+
+    command = [
+        "python3",
+        "-m",
+        "sglang.launch_server",
+        "--model-path",
+        model,
+        "--host",
+        host,
+        "--port",
+        port,
+    ]
+
+    process = subprocess.Popen(command, stdout=None, stderr=None)
 
     start_time = time.time()
     with requests.Session() as session:
@@ -76,12 +119,46 @@ def setUpClass(cls):
             dp_size=1,
             timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
         )
+        cls.other_process = []
 
     @classmethod
     def tearDownClass(cls):
         kill_process_tree(cls.process.pid)
-
-    def test_mmlu(self):
+        for process in cls.other_process:
+            kill_process_tree(process.pid)
+
+    # def test_mmlu(self):
+    #     args = SimpleNamespace(
+    #         base_url=self.base_url,
+    #         model=self.model,
+    #         eval_name="mmlu",
+    #         num_examples=64,
+    #         num_threads=32,
+    #         temperature=0.1,
+    #     )
+
+    #     metrics = run_eval(args)
+    #     score = metrics["score"]
+    #     THRESHOLD = 0.65
+    #     passed = score >= THRESHOLD
+    #     msg = f"MMLU test {'passed' if passed else 'failed'} with score {score:.3f} (threshold: {THRESHOLD})"
+    #     self.assertGreaterEqual(score, THRESHOLD, msg)
+
+    def test_add_worker(self):
+        # 1. start a worker, and wait until it is healthy
+        port = find_available_port()
+        worker_url = f"http://127.0.0.1:{port}"
+        worker_process = popen_launch_server(
+            self.model, worker_url, DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH
+        )
+        self.other_process.append(worker_process)
+        # 2. use /add_worker api to add it the the router
+        with requests.Session() as session:
+            response = session.post(
+                f"{self.base_url}/add_worker", json={"url": worker_url}
+            )
+            self.assertEqual(response.status_code, 200)
+        # 3. run mmlu
         args = SimpleNamespace(
             base_url=self.base_url,
             model=self.model,
@@ -90,7 +167,6 @@ def test_mmlu(self):
             num_threads=32,
             temperature=0.1,
         )
-
         metrics = run_eval(args)
         score = metrics["score"]
         THRESHOLD = 0.65