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_unsubscribe(self):
""" Unsubscribes all listeners for events with name """
emitter = Emitter()
def dontcallme(arg1, arg2):
self.fail('Called an unsubscribed function')
emitter.on('test', dontcallme)
emitter.off('test')
emitter.emit('test')
def test_subscribes_with_context(self):
""" Subscribes to an event and context is passed """
emitter = Emitter()
context = {'context_value': True}
def ctxfunc(context_value=None):
self.assertTrue(context_value)
emitter.on('test', ctxfunc, context)
emitter.emit('test')
def test_args(self):
""" Passes all arguments to event listener """
emitter = Emitter()
function_called = {'value': False}
def twoargs(arg1, arg2):
self.assertEqual(arg1, 'arg1')
self.assertEqual(arg2, 'arg2')
emitter.on('test', twoargs)
emitter.emit('test', 'arg1', 'arg2')
def test_emit(self):
""" Emits an event """
emitter = Emitter()
function_called = {'value': False}
def wasicalled():
function_called['value'] = True
emitter.on('test', wasicalled)
emitter.emit('test')
self.assertTrue(function_called['value'])
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')
def test_remove_inside_event(self):
""" Removes an event inside another event """
emitter = Emitter()
def callme():
self.assertEqual(len(emitter._e['test']), 1,
'event is still in the list')
emitter.off('test')
self.assertNotIn('test', emitter._e)
emitter.on('test', callme)
emitter.emit('test')
def test_unsubscribe_single(self):
""" Unsubscribes one listener for events with name """
emitter = Emitter()
function_called = {'value': False}
def dontcallme(arg1, arg2):
self.fail('Called an unsubscribed function')
def wasicalled():
function_called['value'] = True
emitter.on('test', dontcallme)
emitter.on('test', wasicalled)
emitter.off('test', dontcallme)
emitter.emit('test')
self.assertTrue(function_called['value'])
def test_subscribes(self):
""" Subscribes to an event """
emitter = Emitter()
emitter.on('test', lambda: None)
self.assertEqual(len(emitter._e['test']), 1)