110067722: Add form validation for duplicate service name.

tests/app/main/test_add_service_form.py

@@ -0,0 +1,18 @@
+from app.main.dao import services_dao
+from app.main.forms import AddServiceForm
+from tests.app.main import create_test_user
+
+
+def test_form_should_have_errors_when_duplicate_service_is_added(notifications_admin,
+                                                                 notifications_admin_db,
+                                                                 notify_db_session):
+    with notifications_admin.test_request_context(method='POST',
+                                                  data={'service_name': 'some service'}) as req:
+        user = create_test_user()
+        services_dao.insert_new_service('some service', user)
+        req.session['user_id'] = user.id
+        form = AddServiceForm(req.request.form)
+        assert form.validate() is False
+        assert len(form.errors) == 1
+        expected = {'service_name': ['Duplicate service name']}
+        assert form.errors == expected