import pytest

from notifier import Notifier

@pytest.fixture
def uut():
    return Notifier()

def checkEvent(uut, event):
    callbacks = 2
    calledFlags = [False] * 2

    def createCallback(i):
        def cb():
            nonlocal calledFlags
            calledFlags[i] = True
        return cb

    for i in range(0, callbacks):
        uut.registerCallback(event, createCallback(i))

    assert not any(calledFlags)
    uut.notify(event)
    assert all(calledFlags)

def test_allEvents(uut):
    checkEvent(uut, Notifier.PLAYING_STATE_EVENT)

def test_eventWithoutRegisteredCallbacks(uut):
    uut.notify(Notifier.PLAYING_STATE_EVENT)
    # expect no crash