def test_on():
"""api.on() works as advertised"""
count = {"#": 0}
def on_event():
count["#"] += 1
pipeline.on("some_event", on_event)
assert_equals(count["#"], 0)
pipeline.emit("some_event")
assert_equals(count["#"], 1)
def test_on_with_garbage_callback():
"""api.on() runs all callbacks, unless they've been garbage collected"""
count = {"#": 0}
def on_goodbye():
count["#"] += 1
pipeline.on("some_event", on_goodbye)
assert_equals(count["#"], 0)
pipeline.emit("some_event")
assert_equals(count["#"], 1)
del on_goodbye
pipeline.emit("some_event")
assert_equals(count["#"], 1)
def test_on_with_failing_callback():
"""api.on() runs all callbacks, regardless of some failing"""
count = {"#": 0}
def bad_event():
count["#"] -= 1
raise Exception("I'm a dick")
def good_event():
count["#"] += 1
pipeline.on("some_event", bad_event)
pipeline.on("some_event", good_event)
assert_equals(count["#"], 0)
pipeline.emit("some_event")
assert_equals(count["#"], 0)