def test_missing_component_no_exception(self):
     """If a component no longer exists at the path to receive the notification, no error should occur."""
     v = ViewState(MagicMock())
     n = NotificationCentre(v)
     v.component_from_path = MagicMock(return_value=None)
     n.subscribe_to_notification('test_notification', 'page.test_component')
     n.post_notification('test_notification')
    def test_queue_load_shortcut_with_scroll_top(self):
        """Test that the queue_load shortcut queues a client load:scrolltop notification for the specified path."""
        v = ViewState(MagicMock())
        nc = NotificationCentre(v)

        nc.queue_client_notification = MagicMock()
        nc.queue_load('test.controller', scroll_top=True)
        nc.queue_client_notification.assert_called_with('load:scroll_top', 'test.controller')
    def test_viewstate_cannot_be_set(self):
        """ViewState is read only and can not be set once the NC is instantiated."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)
        new_v = ViewState(MagicMock())

        with self.assertRaises(AttributeError):
            n.view_state = new_v
    def test_force_same_notification_multiple_queue(self):
        """The same notification will be queued twice if the force arg is True."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)

        n.queue_client_notification('test_name', 'page.test_component')
        n.queue_client_notification('test_name', 'page.test_component', force=True)
        queued_notifications = [notification for notification in n]
        self.assertEqual(len(queued_notifications), 2)
        self.assertEqual(queued_notifications[0], queued_notifications[1])
    def test_client_notification_queue_and_retrieve(self):
        """Client notifications are queued and retrieved in FIFO order."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)

        n.queue_client_notification('test_name', 'page.test_component')
        n.queue_client_notification('test_name2', 'page.test_component2', 'somedata')

        # notifications are retrieved FIFO
        queued_notifications = [notification for notification in n]
        self.assertEqual(len(queued_notifications), 2)
        self.assertEqual({'name': 'test_name', 'path': 'page.test_component'}, queued_notifications[0])
        self.assertEqual({'name': 'test_name2', 'path': 'page.test_component2', 'data': 'somedata'},
                         queued_notifications[1])

        # queue should now be empty
        self.assertEqual(len([notification for notification in n]), 0)
    def test_specific_notification_subscription_and_receive(self):
        """A component can listen to events from only single sources, so shouldn't receive that notification if posted
        from elsewhere."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)
        component = MagicMock()
        v.component_from_path = MagicMock(return_value=component)

        n.subscribe_to_notification('test_notification', 'page.test_component', 'page.source_component')
        n.post_notification('test_notification')
        n.post_notification('test_notification', 'page.another_source')
        self.assertEqual(component.process_notification.call_count, 0)

        n.post_notification('test_notification', 'page.source_component')
        component.process_notification.assert_called_with('test_notification', None)
    def test_global_notification_subscription_and_receive(self):
        """A component that subscribes to a notification with a blank source, should receive that notification no matter
        what source posts it."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)
        component = MagicMock()
        v.component_from_path = MagicMock(return_value=component)

        n.subscribe_to_notification('test_notification', 'page.test_component')
        n.post_notification('test_notification')
        component.process_notification.assert_called_with('test_notification', None)

        n.subscribe_to_notification('test_notification2', 'page.test_component')
        n.post_notification('test_notification2', 'page.another_component')
        component.process_notification.assert_called_with('test_notification2', None)
    def test_unsubscribe_non_existant_without_error(self):
        """Test that unsubscribing from a notification that isn't being listened to, and from a controller that hasn't
        been subscribed to, doesn't raise an error."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)

        n.unsubscribe_from_notification('non-existant', 'not.a.real.path')
        n.subscribe_to_notification('real-notification', 'listener.path', 'a.real.path')
        n.unsubscribe_from_notification('real-notification', 'listener.path', 'not.a.real.path')
    def test_notification_unsubscribe(self):
        """After a component unsubscribes, it should not receive that notification any more (but should still receive
        others that it is subscribed to)."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)
        component = MagicMock()
        v.component_from_path = MagicMock(return_value=component)

        n.subscribe_to_notification('test_notification', 'page.test_component')
        n.subscribe_to_notification('test_notification2', 'page.test_component')
        n.unsubscribe_from_notification('test_notification', 'page.test_component')
        n.post_notification('test_notification')
        self.assertEqual(component.process_notification.call_count, 0)
        n.post_notification('test_notification2')
        component.process_notification.assert_called_with('test_notification2', None)
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 def test_no_listeners_no_exception(self):
     """If there is no listener for a notification, no error should occur."""
     v = ViewState(MagicMock())
     n = NotificationCentre(v)
     n.post_notification('test_notification')
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    def test_same_notification_multiple_queue(self):
        """The same notification will not be queued twice, however if any of name, path or data differs, it will."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)

        n.queue_client_notification('test_name', 'page.test_component')
        n.queue_client_notification('test_name', 'page.test_component')
        self.assertEqual(len([notification for notification in n]), 1)

        n.queue_client_notification('test_name', 'page.test_component')
        n.queue_client_notification('test_name', 'page.test_component', 'somedata')
        self.assertEqual(len([notification for notification in n]), 2)

        n.queue_client_notification('test_name', 'page.test_component2')
        n.queue_client_notification('test_name', 'page.test_component')
        self.assertEqual(len([notification for notification in n]), 2)

        n.queue_client_notification('test_name', 'page.test_component')
        n.queue_client_notification('test_name2', 'page.test_component')
        self.assertEqual(len([notification for notification in n]), 2)
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    def test_notification_unsubscribe_all(self):
        """nc.unsubscribe_from_all_notifications should prevent any more calls going to the component."""
        v = ViewState(MagicMock())
        n = NotificationCentre(v)
        component = MagicMock()
        v.component_from_path = MagicMock(return_value=component)

        n.subscribe_to_notification('test_notification', 'page.test_component')
        n.subscribe_to_notification('test_notification2', 'page.test_component')
        n.unsubscribe_from_all_notifications('page.test_component')
        n.post_notification('test_notification')
        n.post_notification('test_notification2')
        self.assertEqual(component.process_notification.call_count, 0)