1 files changed, 21 insertions, 0 deletions
diff --git a/Lib/test/test_uuid.py b/Lib/test/test_uuid.py
index 43fa656..7ba0967 100644
--- a/Lib/test/test_uuid.py
+++ b/Lib/test/test_uuid.py
@@ -1,6 +1,8 @@
 from unittest import TestCase
 from test import support
 import builtins
+import io
+import os
 import uuid
 
 def importable(name):
@@ -360,6 +362,25 @@ class TestUUID(TestCase):
 
         self.assertEqual(node1, node2)
 
+    def test_find_mac(self):
+        data = '''\
+
+fake hwaddr
+cscotun0  Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
+eth0      Link encap:Ethernet  HWaddr 12:34:56:78:90:ab
+'''
+        def mock_popen(cmd):
+            return io.StringIO(data)
+
+        with support.swap_attr(os, 'popen', mock_popen):
+            mac = uuid._find_mac(
+                command='ifconfig',
+                args='',
+                hw_identifiers=['hwaddr'],
+                get_index=lambda x: x + 1,
+            )
+            self.assertEqual(mac, 0x1234567890ab)
+
     def test_uuid1(self):
         # uuid1 requires ctypes.
         try: