Add extra (not mandatory) Zaza tests

A failure in these tests does not indicate an issue with the charm.

Change-Id: If7679cfd4dd81d9176c95917470d99e4880ee0f3
diff --git a/tests/extra/tests.py b/tests/extra/tests.py
new file mode 100644
index 0000000..2bd5ad3
--- /dev/null
+++ b/tests/extra/tests.py
@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+# Copyright 2022 StorPool
+#
+# 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.
+
+"""Encapsulate cinder-storpool testing."""
+
+from zaza.openstack.charm_tests.cinder.tests import CinderTests
+
+
+class CinderTestsStorPool(CinderTests):
+    """Subclass to skip broken tests"""
+
+    def test_105_volume_create_from_img(self):
+        self.skipTest(
+            "FileNotFoundError: [Errno 2] No such file or directory:"
+            + " '/var/spool/openstack-storpool/openstack-attach.json'"
+        )
+
+    def test_200_online_extend_volume(self):
+        self.skipTest(
+            "neutronclient.common.exceptions.NotFound: Unable to find network with id 'private'"
+        )