def test_weak_references(self):
observable = Observable("Event observer")
observable.addEvent("event")
self.addAndRemoveListener(observable) #the listener dies when the method returns.
observable.notify("event") # Should not raise assertion error
def test_weak_references(self):
observable = Observable("Event observer")
observable.addEvent("event")
class WeakTest(object):
def __init__(self):
self.value = 0
def listener(self):
raise AssertionError("This should be caught!")
o = WeakTest()
observable.attach("event", o.listener)
with self.assertRaises(AssertionError):
observable.notify("event")
del o
observable.notify("event") # Should not raise assertion error
def test_events(self):
observable = Observable("Event observer")
observable.addEvent("event1")
observable.addEvent("event2")
def event1():
raise ValueError("event 1 error")
def event2():
raise NotImplementedError("event 1 error")
observable.attach("event1", event1)
observable.attach("event2", event2)
with self.assertRaises(ValueError):
observable.notify("event1")
with self.assertRaises(NotImplementedError):
observable.notify("event2")
with self.assertRaises(LookupError):
observable.notify("event3")
observable.detach("event2", event2)
# no exception raised when notify list is empty
observable.notify("event2")
with self.assertRaises(LookupError):
observable.detach("event3", event2)
def test_observable(self):
observable = Observable("Test Observer")
observable.addEvent("test_event")
self.assertTrue("test_event" in observable)
observable.attach("test_event", self.observeWithSelf)
observable.attach("test_event", observeWithoutSelf)
with self.assertRaises(AssertionError):
observable.attach("test_event", "Fail!") #not a callable
with self.assertRaises(LookupError):
observable.attach("fail", observeWithoutSelf) # not a valid event
observable.notify("test_event")
observable.detach("test_event", observeWithoutSelf)
with self.assertRaises(ValueError):
observable.detach("test_event", observeWithoutSelf)
observer_as_lambda = lambda : observeWithoutSelf()
observable.attach("test_event", observer_as_lambda)
observable.notify("test_event")
observable.detach("test_event", observer_as_lambda)
def test_events(self):
observable = Observable("Event observer")
observable.addEvent("event1")
observable.addEvent("event2")
def event1():
raise ValueError("event 1 error")
def event2():
raise NotImplementedError("event 1 error")
observable.attach("event1", event1)
observable.attach("event2", event2)
with self.assertRaises(ValueError):
observable.notify("event1")
with self.assertRaises(NotImplementedError):
observable.notify("event2")
with self.assertRaises(LookupError):
observable.notify("event3")
observable.detach("event2", event2)
# no exception raised when notify list is empty
observable.notify("event2")
with self.assertRaises(LookupError):
observable.detach("event3", event2)
def test_observable(self):
observable = Observable("Test Observer")
observable.addEvent("test_event")
self.assertTrue("test_event" in observable)
observable.attach("test_event", self.observeWithSelf)
observable.attach("test_event", observeWithoutSelf)
with self.assertRaises(AssertionError):
observable.attach("test_event", "Fail!") #not a callable
with self.assertRaises(LookupError):
observable.attach("fail", observeWithoutSelf) # not a valid event
observable.notify("test_event")
observable.detach("test_event", observeWithoutSelf)
with self.assertRaises(ValueError):
observable.detach("test_event", observeWithoutSelf)
observer_as_lambda = lambda : observeWithoutSelf()
observable.attach("test_event", observer_as_lambda)
observable.notify("test_event")
observable.detach("test_event", observer_as_lambda)
def __new__(cls, *args, **kwargs):
# print("Construct: %s" % cls.__name__)
obj = super(ModelMixin, cls).__new__(cls)
obj.__observable = Observable(cls.__name__)
obj.registerDefaultEvents()
return obj