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diff --git a/installers/charm/grafana/tests/__init__.py b/installers/charm/grafana/tests/__init__.py
new file mode 100644
index 00000000..446d5cee
--- /dev/null
+++ b/installers/charm/grafana/tests/__init__.py
@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# Copyright 2020 Canonical Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact: legal@canonical.com
+#
+# To get in touch with the maintainers, please contact:
+# osm-charmers@lists.launchpad.net
+##
+
+"""Init mocking for unit tests."""
+
+import sys
+
+
+import mock
+
+
+class OCIImageResourceErrorMock(Exception):
+    pass
+
+
+sys.path.append("src")
+
+oci_image = mock.MagicMock()
+oci_image.OCIImageResourceError = OCIImageResourceErrorMock
+sys.modules["oci_image"] = oci_image
+sys.modules["oci_image"].OCIImageResource().fetch.return_value = {}