diff --git a/test/unittests/test_bootstrap.py b/test/unittests/test_bootstrap.py
index 61ed6fee30..6fbe4f3b04 100644
--- a/test/unittests/test_bootstrap.py
+++ b/test/unittests/test_bootstrap.py
@@ -395,7 +395,7 @@ def test_get_sbd_device_interactive_diskless(self, mock_status, mock_confirm, mo
         bootstrap._context = mock.Mock(yes_to_all=False)
         mock_confirm.return_value = True
         mock_no_overwrite.return_value = False
-        mock_from_config.return_value = None
+        mock_from_config.return_value = []
         mock_prompt.return_value = "none"
 
         self.sbd_inst._get_sbd_device_interactive()
@@ -413,7 +413,7 @@ def test_get_sbd_device_interactive_null_and_diskless(self, mock_status, mock_co
         bootstrap._context = mock.Mock(yes_to_all=False)
         mock_confirm.return_value = True
         mock_no_overwrite.return_value = False
-        mock_from_config.return_value = None
+        mock_from_config.return_value = []
         mock_prompt.side_effect = [None, "none"]
 
         self.sbd_inst._get_sbd_device_interactive()
@@ -438,7 +438,7 @@ def test_get_sbd_device_interactive(self, mock_status, mock_confirm, mock_from_c
         bootstrap._context = mock.Mock(yes_to_all=False)
         mock_confirm.side_effect = [True, False, True]
         mock_no_overwrite.return_value = False
-        mock_from_config.return_value = None
+        mock_from_config.return_value = []
         mock_prompt.side_effect = ["/dev/test1", "/dev/sda1", "/dev/sdb1"]
         mock_split.side_effect = [["/dev/test1"], ["/dev/sda1"], ["/dev/sdb1"]]
         mock_verify.side_effect = [ValueError("/dev/test1 error"), None, None]