[#1493] Enable IPv6 stats system test

tests/system/tests/test_stats.py

@@ -35,11 +35,11 @@ def test_get_kea_stats(
     # 9 leases are initially store in the lease database
     assert int(data.dhcp4_stats.assigned_addresses) > 9
     assert data.subnets4.items is not None
-    # ToDo: Add support for generation IPv6 traffic.
-    # assert int(data['dhcp6_stats']['assignedNAs']) > 9
-    # assert data['subnets6']['items'] is not None
+    # ToDo: When we add support for IPv6 traffic generation
+    # we will be able to test the number of assigned addresses
+    # is greater than 9.
+    assert int(data.dhcp6_stats.assigned_nas) == 9
+    assert data.subnets6.items is not None
 
     # Check if Stork Agent handles all metrics returned by Kea.
-    # Disable this check because Prometheus is missing pool stats.
-    # @todo: enable after fixing #1153.
-    # assert not kea_service.has_encountered_unsupported_statistic()
+    assert not kea_service.has_encountered_unsupported_statistic()