diff --git a/tests/test_network_connections.py b/tests/test_network_connections.py
index 67cb1c9..5207999 100755
--- a/tests/test_network_connections.py
+++ b/tests/test_network_connections.py
@@ -11,7 +11,7 @@ TESTS_BASEDIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.insert(1, os.path.join(TESTS_BASEDIR, "..", "library"))
 
 import network_connections as n
-from network_connections import SysUtil
+from network_connections import SysUtil, Util
 
 
 try:
@@ -1880,6 +1880,13 @@ class TestNM(unittest.TestCase):
         self.assertIsNotNone(connections)
 
 
+class TestUtils(unittest.TestCase):
+    def test_check_output(self):
+        res = Util.check_output(["echo", "test"])
+        self.assertEqual(res, "test\n")
+        self.assertRaises(n.MyError, Util.check_output, ["false"])
+
+
 class TestSysUtils(unittest.TestCase):
     def test_link_read_permaddress(self):
         # Manipulate PATH to use ethtool mock script to avoid hard dependency on