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diff --git a/installers/charm/osm-update-db-operator/tests/unit/test_charm.py b/installers/charm/osm-update-db-operator/tests/unit/test_charm.py
new file mode 100644
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+++ b/installers/charm/osm-update-db-operator/tests/unit/test_charm.py
@@ -0,0 +1,165 @@
+# Copyright 2022 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.
+
+import unittest
+from unittest.mock import Mock, patch
+
+from ops.model import ActiveStatus, BlockedStatus, MaintenanceStatus
+from ops.testing import Harness
+
+from charm import UpgradeDBCharm
+
+
+class TestCharm(unittest.TestCase):
+    def setUp(self):
+        self.harness = Harness(UpgradeDBCharm)
+        self.addCleanup(self.harness.cleanup)
+        self.harness.begin()
+
+    def test_initial_config(self):
+        self.assertEqual(self.harness.model.unit.status, MaintenanceStatus(""))
+
+    def test_config_changed(self):
+        self.harness.update_config({"mongodb-uri": "foo"})
+        self.assertEqual(self.harness.model.unit.status, ActiveStatus())
+
+    def test_config_changed_blocked(self):
+        self.harness.update_config({"log-level": "DEBUG"})
+        self.assertEqual(
+            self.harness.model.unit.status,
+            BlockedStatus("mongodb-uri and/or mysql-uri must be set"),
+        )
+
+    def test_update_db_fail_only_params(self):
+        action_event = Mock(
+            params={
+                "current-version": 9,
+                "target-version": 10,
+                "mysql-only": True,
+                "mongodb-only": True,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        self.assertEqual(
+            action_event.fail.call_args,
+            [("Failed DB Upgrade: cannot set both mysql-only and mongodb-only options to True",)],
+        )
+
+    @patch("charm.MongoUpgrade")
+    @patch("charm.MysqlUpgrade")
+    def test_update_db_mysql(self, mock_mysql_upgrade, mock_mongo_upgrade):
+        self.harness.update_config({"mysql-uri": "foo"})
+        action_event = Mock(
+            params={
+                "current-version": 9,
+                "target-version": 10,
+                "mysql-only": True,
+                "mongodb-only": False,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        mock_mysql_upgrade().upgrade.assert_called_once()
+        mock_mongo_upgrade.assert_not_called()
+
+    @patch("charm.MongoUpgrade")
+    @patch("charm.MysqlUpgrade")
+    def test_update_db_mongo(self, mock_mysql_upgrade, mock_mongo_upgrade):
+        self.harness.update_config({"mongodb-uri": "foo"})
+        action_event = Mock(
+            params={
+                "current-version": 7,
+                "target-version": 10,
+                "mysql-only": False,
+                "mongodb-only": True,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        mock_mongo_upgrade().upgrade.assert_called_once()
+        mock_mysql_upgrade.assert_not_called()
+
+    @patch("charm.MongoUpgrade")
+    def test_update_db_not_configured_mongo_fail(self, mock_mongo_upgrade):
+        action_event = Mock(
+            params={
+                "current-version": 7,
+                "target-version": 10,
+                "mysql-only": False,
+                "mongodb-only": True,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        mock_mongo_upgrade.assert_not_called()
+        self.assertEqual(
+            action_event.fail.call_args,
+            [("Failed DB Upgrade: mongo-uri not set",)],
+        )
+
+    @patch("charm.MysqlUpgrade")
+    def test_update_db_not_configured_mysql_fail(self, mock_mysql_upgrade):
+        action_event = Mock(
+            params={
+                "current-version": 7,
+                "target-version": 10,
+                "mysql-only": True,
+                "mongodb-only": False,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        mock_mysql_upgrade.assert_not_called()
+        self.assertEqual(
+            action_event.fail.call_args,
+            [("Failed DB Upgrade: mysql-uri not set",)],
+        )
+
+    @patch("charm.MongoUpgrade")
+    @patch("charm.MysqlUpgrade")
+    def test_update_db_mongodb_and_mysql(self, mock_mysql_upgrade, mock_mongo_upgrade):
+        self.harness.update_config({"mongodb-uri": "foo"})
+        self.harness.update_config({"mysql-uri": "foo"})
+        action_event = Mock(
+            params={
+                "current-version": 7,
+                "target-version": 10,
+                "mysql-only": False,
+                "mongodb-only": False,
+            }
+        )
+        self.harness.charm._on_update_db_action(action_event)
+        mock_mysql_upgrade().upgrade.assert_called_once()
+        mock_mongo_upgrade().upgrade.assert_called_once()
+
+    @patch("charm.MongoUpgrade")
+    def test_apply_patch(self, mock_mongo_upgrade):
+        self.harness.update_config({"mongodb-uri": "foo"})
+        action_event = Mock(
+            params={
+                "bug-number": 57,
+            }
+        )
+        self.harness.charm._on_apply_patch_action(action_event)
+        mock_mongo_upgrade().apply_patch.assert_called_once()
+
+    @patch("charm.MongoUpgrade")
+    def test_apply_patch_fail(self, mock_mongo_upgrade):
+        action_event = Mock(
+            params={
+                "bug-number": 57,
+            }
+        )
+        self.harness.charm._on_apply_patch_action(action_event)
+        mock_mongo_upgrade.assert_not_called()
+        self.assertEqual(
+            action_event.fail.call_args,
+            [("Failed Patch Application: mongo-uri not set",)],
+        )