def test_publisher_shall_append_subscription_message_to_queue(cls):
''' msg_queue ~ Provider.notify(msg) ~ Publisher.publish(msg) '''
expected_msg = 'expected msg'
pro = Provider()
pub = Publisher(pro)
cls.assertEqual(len(pro.msg_queue), 0)
pub.publish(expected_msg)
cls.assertEqual(len(pro.msg_queue), 1)
cls.assertEqual(pro.msg_queue[0], expected_msg)
def test_publisher_shall_append_subscription_message_to_queue(cls):
''' msg_queue ~ Provider.notify(msg) ~ Publisher.publish(msg) '''
expected_msg = 'expected msg'
pro = Provider()
pub = Publisher(pro)
cls.assertEqual(len(pro.msg_queue), 0)
pub.publish(expected_msg)
cls.assertEqual(len(pro.msg_queue), 1)
cls.assertEqual(pro.msg_queue[0], expected_msg)
def test_provider_shall_update_affected_subscribers_with_published_subscription(cls):
pro = Provider()
pub = Publisher(pro)
sub1 = Subscriber('sub 1 name', pro)
sub1.subscribe('sub 1 msg 1')
sub1.subscribe('sub 1 msg 2')
sub2 = Subscriber('sub 2 name', pro)
sub2.subscribe('sub 2 msg 1')
sub2.subscribe('sub 2 msg 2')
with patch.object(sub1, 'run') as mock_subscriber1_run,\
patch.object(sub2, 'run') as mock_subscriber2_run:
pro.update()
cls.assertEqual(mock_subscriber1_run.call_count, 0)
cls.assertEqual(mock_subscriber2_run.call_count, 0)
pub.publish('sub 1 msg 1')
pub.publish('sub 1 msg 2')
pub.publish('sub 2 msg 1')
pub.publish('sub 2 msg 2')
with patch.object(sub1, 'run') as mock_subscriber1_run,\
patch.object(sub2, 'run') as mock_subscriber2_run:
pro.update()
expected_sub1_calls = [call('sub 1 msg 1'), call('sub 1 msg 2')]
mock_subscriber1_run.assert_has_calls(expected_sub1_calls)
expected_sub2_calls = [call('sub 2 msg 1'), call('sub 2 msg 2')]
mock_subscriber2_run.assert_has_calls(expected_sub2_calls)