diff --git a/extended-tests.py b/extended-tests.py
index 4556e71..cbb0c36 100644
--- a/extended-tests.py
+++ b/extended-tests.py
@@ -1,6 +1,11 @@
 import json
 import sys
+import time
 import subprocess
+import os
+
+import artiq
+
 
 with open(sys.argv[1], "r") as hydra_json_file:
     hydra_json = json.load(hydra_json_file)
@@ -11,6 +16,18 @@ drv = drv[len("/nix/store/"):]
 hydra_log = "/var/lib/hydra/build-logs/" + drv[:2] + "/" + drv[2:]
 
 with open(hydra_log, "w") as log:
-    def run(*args):
-        subprocess.run(args, stdout=log, stderr=log).check_returncode()
+    def run(*args, **kwargs):
+        subprocess.run(args, stdout=log, stderr=log, **kwargs).check_returncode()
+
     run("artiq_flash", "-t", "kc705", "-V", "nist_clock")
+
+    time.sleep(10)
+
+    run("ping", "kc705-1", "-c10", "-w30")
+
+    env = {
+        "ARTIQ_ROOT": artiq.__path__ + "/examples/kc705_nist_clock",
+        "ARTIQ_LOW_LATENCY": "1"
+    }
+    env.update(os.environ)
+    run("python", "-m", "unittest", "-v", "artiq.test.coredevice", env=env)