diff --git a/functional/common/test.py b/functional/common/test.py
index fa523d7d33..f7f0361eea 100644
--- a/functional/common/test.py
+++ b/functional/common/test.py
@@ -58,8 +58,9 @@ class TestCase(testtools.TestCase):
         return cls.openstack('configuration show ' + opts)
 
     @classmethod
-    def get_opts(cls, fields):
-        return ' -f value ' + ' '.join(['-c ' + it for it in fields])
+    def get_opts(cls, fields, format='value'):
+        return ' -f {0} {1}'.format(format,
+                                    ' '.join(['-c ' + it for it in fields]))
 
     @classmethod
     def assertOutput(cls, expected, actual):