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diff --git a/installers/charm/osm-ng-ui/tests/unit/test_charm.py b/installers/charm/osm-ng-ui/tests/unit/test_charm.py
new file mode 100644
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+++ b/installers/charm/osm-ng-ui/tests/unit/test_charm.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+# 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.
+#
+# 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
+#
+# Learn more about testing at: https://juju.is/docs/sdk/testing
+
+import pytest
+from ops.model import ActiveStatus, BlockedStatus
+from ops.testing import Harness
+from pytest_mock import MockerFixture
+
+from charm import CharmError, OsmNgUiCharm, check_service_active
+
+container_name = "ng-ui"
+service_name = "ng-ui"
+
+sites_default = """
+server {
+    listen       80;
+    server_name  localhost;
+    root   /usr/share/nginx/html;
+    index  index.html index.htm;
+    client_max_body_size 50M;
+
+    location /osm {
+        proxy_pass https://nbi:9999;
+        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
+        proxy_set_header Accept-Encoding "";
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}
+"""
+
+
+@pytest.fixture
+def harness(mocker: MockerFixture):
+    mocker.patch("charm.KubernetesServicePatch", lambda x, y: None)
+    harness = Harness(OsmNgUiCharm)
+    harness.begin()
+    harness.charm.unit.get_container("ng-ui").push(
+        "/etc/nginx/sites-available/default", sites_default, make_dirs=True
+    )
+    yield harness
+    harness.cleanup()
+
+
+def test_missing_relations(harness: Harness):
+    harness.charm.on.config_changed.emit()
+    assert type(harness.charm.unit.status) == BlockedStatus
+    assert harness.charm.unit.status.message == "need nbi relation"
+
+
+def test_ready(harness: Harness):
+    _add_relation(harness)
+    assert harness.charm.unit.status == ActiveStatus()
+
+
+def test_container_stops_after_relation_broken(harness: Harness):
+    harness.charm.on[container_name].pebble_ready.emit(container_name)
+    container = harness.charm.unit.get_container(container_name)
+    relation_id = _add_relation(harness)
+    check_service_active(container, service_name)
+    harness.remove_relation(relation_id)
+    with pytest.raises(CharmError):
+        check_service_active(container, service_name)
+
+
+def _add_relation(harness: Harness):
+    # Add nbi relation
+    relation_id = harness.add_relation("nbi", "nbi")
+    harness.add_relation_unit(relation_id, "nbi/0")
+    harness.update_relation_data(relation_id, "nbi", {"host": "nbi", "port": 9999})
+    return relation_id