def test_only_once(self):
""" Subscribes to an event only once"""
emitter = Emitter()
def callmeonce():
self.assertNotIn('test', emitter._e)
emitter.once('test', callmeonce)
emitter.emit('test')
def test_only_once_context(self):
""" Subscribing to an event only once keeps context """
emitter = Emitter()
context = {'context_value': True}
def callmeonce(context_value=None):
self.assertTrue(context_value)
self.assertNotIn('test', emitter._e)
emitter.once('test', callmeonce, context)
emitter.emit('test')