def test_can_subscribe_to_unpublished_message():
bus = Bus()
func = lambda x: x
bus.subscribe("some message", func)
assert "some message" in bus.subscribers
assert len(bus.subscribers["some message"]) == 1
assert bus.subscribers["some message"][0] is func
def test_can_subscribe_and_get_results_on_publish():
results = []
def proc(x):
results.append(x)
bus = Bus()
func = proc
bus.subscribe("some message", func)
bus.publish("some message", x="text")
assert len(results) == 1
assert results[0] == "text"
def test_can_subscribe_and_get_results_on_publish_for_more_than_one_subscriber():
results = []
def proc(x):
results.append(x + "1")
def proc2(x):
results.append(x + "2")
bus = Bus()
bus.subscribe("some message", proc)
bus.subscribe("some message", proc2)
bus.publish("some message", x="text")
assert len(results) == 2
assert results[0] == "text1"
assert results[1] == "text2"
def test_bus_can_publish_messages_with_no_listeners():
bus = Bus()
bus.publish("some message", text="some")
assert True, "If it got this far the message was published without errors."