I'm not the unit tests expert (sadly), but asked myself the same question a while back, and was able to come up with something. Probably there are more elegant ways to do that...   The tests below are testing a very simple NSO service package. It tests the methods that the create callback is calling and then also tests cb_create() itself to make sure it calls everything it should.   Hope it helps!   #!/usr/bin/env python # -*- coding: utf-8 -*- import mock import unittest import sys sys.path.insert(0, '../../python') mock.patch('ncs.application.Service.create', staticmethod(lambda x: x)).start() from nso_basic.main import ServiceCallbacks # noqa: E402 @mock.patch.object(ServiceCallbacks, "__init__", lambda x, y, z, w: None) class nsoBasicTestCase(unittest.TestCase): def test_foo(self): # instantiate our service instance = ServiceCallbacks(None, None, None) instance.log = log() self.assertEqual(instance.foo(None), None, "Should be None") def test_calc_mask(self): # instantiate our service instance = ServiceCallbacks(None, None, None) instance.log = log() service = mock.Mock() service.ip = '1.2.3.4' service.mask = '16' self.assertEqual(instance.calc_mask(service), '255.255.0.0', 'Should be 255.255.0.0') def test_calc_desc(self): # instantiate our service instance = ServiceCallbacks(None, None, None) instance.log = log() service = mock.Mock() service.description = 'short desc' self.assertEqual(instance.calc_desc(service), 'short desc', 'Should be short desc') service.description = 'very very long description' self.assertEqual(instance.calc_desc(service), 'very-ption', 'Should be very-ption') # decorators are applied BOTTOM-UP. # Order of argument for the test method should match @mock.patch('ncs.template.Template', autospec=True) @mock.patch('ncs.template.Variables', autospec=True) def test_cb_create(self, mock_variable, mock_template): ''' Test that cb_create is calling all functions it suppose to call. ''' # instantiate our service instance = ServiceCallbacks(None, None, None) instance.log = log() instance.calc_mask = mock.MagicMock(return_value='255.255.0.0') instance.calc_desc = mock.MagicMock(return_value='short desc') service = mock.Mock() service._path = 'cb/create/test' service.description = 'short desc' service.ip = '1.2.3.4' service.mask = '16' # Mock a Variables instance to be able to count the times add is called instance.mock_var = mock_variable() # Same for Template and apply method instance.mock_temp = mock_template(service) tctx = None root = None proplist = None instance.cb_create(tctx, root, service, proplist) self.assertTrue(instance.calc_mask.called) self.assertTrue(instance.calc_desc.called) self.assertEqual(instance.mock_var.add.call_count, 2) self.assertEqual(instance.mock_temp.apply.call_count, 1) class log(): def debug(self, *args): print('DEBUG: {}'.format(''.join(str(x) for x in args))) def info(self, *args): print('INFO: {}'.format(''.join(str(x) for x in args))) def error(self, *args): print('ERROR: {}'.format(''.join(str(x) for x in args))) ... View more

It looked to me as a UI thingy more than a YANG thingy as your model looks quite straightforward. I don't use the UI too often, so I had to try and load your model and check for myself.   (don't ask me why, but) Seems as by default, most of the leafs you defined in your model are hidden in the UI.   Once you selected the service manager, selected your service point, created a new entry and clicked it, you need to click 'view options' at the top-right corner.     You should move it from 'configuration only' to 'full model'. Once you do that, you should see your entire model.     For the question why it doesn't show by default, I must say I don't know. Those leafs are definitely configuration, so they should show even when configuration only is selected.   Generally speaking, if you try things through the UI and something is not working as you expect, I suggest checking the same through the CLI. In most cases, this will tell you if there's an issue with your model, or you're facing some sort of UI issue.     ... View more