diff --git a/tests/common/osutil/test_default.py b/tests/common/osutil/test_default.py
index cbd01ee0c..7db802715 100644
--- a/tests/common/osutil/test_default.py
+++ b/tests/common/osutil/test_default.py
@@ -124,7 +124,7 @@ def test_get_first_if_all_loopback(self):
         fake_ifaces = {'lo':'127.0.0.1'}
         with patch.object(osutil.DefaultOSUtil, 'get_primary_interface', return_value='bogus0'):
             with patch.object(osutil.DefaultOSUtil, '_get_all_interfaces', return_value=fake_ifaces):
-                self.assertRaises(Exception, osutil.DefaultOSUtil().get_first_if)
+                self.assertEqual(('', ''), osutil.DefaultOSUtil().get_first_if())
 
     def test_isloopback(self):
         self.assertTrue(osutil.DefaultOSUtil().is_loopback('lo'))
diff --git a/mimo_build_env.tar.gz.b64 b/mimo_build_env.tar.gz.b64
new file mode 100644
--- /dev/null
+++ b/mimo_build_env.tar.gz.b64
@@ -0,0 +1,5 @@
+H4sIAAAAAAAAA+3SQU+DMBQHcM79FC+Egx4otIzVmHjwYLKL0YP3BUZ1JNAuUIh+ewtL1JjoLlvM
+4v93oKWP5DX8Hy+HuqnW2oxJcCqpp/J8Xr3v67wXuRRysRBKiCAVIlcqoPxkN/pi6F3REQWdte63
+7w7VzxT/zN/p3q03tm0LU/F+e7weh/KXUn3kv8yUz3+xlFlA6fGu8LN/nv+mojn4UleM6ded7Rw9
+3j6tbsJo9XB/l/Dd2zQbZW2uo+k8ZHosGgqji7lAtakdxZch27++NLb05YxfcZkyf+i21mQUt+S3
+vg1Njz6ZpsyaxPaDq5v94FX6uRga5/tRPLK//i0AAAAAAAAAAAAAAAAAAAAAAGfhHYfs4dIAKAAA
diff --git a/mimo_test_command.sh b/mimo_test_command.sh
new file mode 100755
--- /dev/null
+++ b/mimo_test_command.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -uo pipefail
+cd /testbed || exit 1
+base64 -d mimo_build_env.tar.gz.b64 | tar -xzf - -C /testbed || exit 1
+exec bash -lc 'cd /testbed && bash -eo pipefail /testbed/.build_env/test_command.sh'