import pytest
from app.hooks import EventDispatcher, listen_event

def test_register_and_dispatch():
    results = []
    def listener1(a, b=None):
        results.append(('l1', a, b))
    def listener2(a, b=None):
        results.append(('l2', a, b))
    EventDispatcher.register('test_event', listener1)
    EventDispatcher.register('test_event', listener2)
    EventDispatcher.dispatch('test_event', 1, b=2)
    assert ('l1', 1, 2) in results
    assert ('l2', 1, 2) in results

def test_listen_event_decorator():
    results = []
    @listen_event('decorated_event')
    def handler(x):
        results.append(x)
    EventDispatcher.dispatch('decorated_event', 'hello')
    assert results == ['hello']