def test_external_bus_forwards_addressed_messages_to_send_handler():
message = create_some_message()
send_handler = Mock()
bus = ExternalBus(send_handler)
bus.send(message, 'some_node')
send_handler.assert_called_once_with(message, 'some_node')
def test_external_bus_queues_sent_messages_sequentially():
messages = [(create_some_message(), choice(['some_node', 'other_node', None]))
for _ in range(100)]
send_handler = Mock()
bus = ExternalBus(send_handler)
for message, dst in messages:
bus.send(message, dst)
assert send_handler.mock_calls == [call(msg, dst) for msg, dst in messages]