Introduce parametrized fixture for collecting groups
diff --git a/cvp_checks/tests/test_default_gateway.py b/cvp_checks/tests/test_default_gateway.py
index cac5328..69fd116 100644
--- a/cvp_checks/tests/test_default_gateway.py
+++ b/cvp_checks/tests/test_default_gateway.py
@@ -4,13 +4,9 @@
 from cvp_checks import utils
 
 
-@pytest.mark.parametrize(
-    "group",
-    utils.node_groups.keys()
-)
-def test_check_default_gateways(local_salt_client, group):
+def test_check_default_gateways(local_salt_client, nodes_in_group):
     netstat_info = local_salt_client.cmd(
-        "L@"+','.join(utils.node_groups[group]), 'cmd.run', ['ip r | sed -n 1p'], expr_form='compound')
+        "L@"+','.join(nodes_in_group), 'cmd.run', ['ip r | sed -n 1p'], expr_form='compound')
 
     gateways = {}
     nodes = netstat_info.keys()
@@ -22,7 +18,6 @@
             gateways[netstat_info[node]].append(node)
 
     assert len(gateways.keys()) == 1, \
-        "There were found few gateways within group {group}: {gw}".format(
-        group=group,
+        "There were found few gateways: {gw}".format(
         gw=json.dumps(gateways, indent=4)
     )