Bug 2011 fixed

Change-Id: I4767a45e87ade9e2d3523c5a1f56ce1e091027d7
Signed-off-by: sritharan <priyadarshini@tataelxsi.co.in>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/osm_mon/tests/unit/collector/vnf_collectors/test_openstack.py b/osm_mon/tests/unit/collector/vnf_collectors/test_openstack.py
index 0fc5e99..0b4f4a7 100644
--- a/osm_mon/tests/unit/collector/vnf_collectors/test_openstack.py
+++ b/osm_mon/tests/unit/collector/vnf_collectors/test_openstack.py
@@ -205,6 +205,7 @@
         self, build_gnocchi_client, build_neutron_client
     ):
         mock_gnocchi_client = mock.Mock()
+        mock_vim_session = mock.Mock()
         mock_gnocchi_client.resource.search.return_value = [
             {"id": "test_id"},
         ]
@@ -237,7 +238,7 @@
 
         build_gnocchi_client.return_value = mock_gnocchi_client
 
-        backend = GnocchiBackend({"_id": "test_uuid"})
+        backend = GnocchiBackend({"_id": "test_uuid"}, mock_vim_session)
         value = backend._collect_instance_disk_metric(
             "disk_read_bytes", "test_resource_id"
         )