def test_notification_of_change(self):
"""
Test notifications with Transition object.
"""
dispatcher = self.dispatcher
element = UML.Transition()
g = element.guard = UML.Constraint()
dispatcher.register_handler(self._handler, element,
'guard.specification')
assert len(dispatcher._handlers) == 2
assert not self.events
g.specification = 'x'
assert len(self.events) == 1, self.events
element.guard = UML.Constraint()
assert len(self.events) == 2, self.events
def test_notification_with_incompatible_elements(self):
"""
Test unregister with composition. Use Class.ownedOperation.precondition.
"""
dispatcher = self.dispatcher
element = UML.Transition()
g = element.guard = UML.Constraint()
dispatcher.register_handler(self._handler, element,
'guard.specification')
assert len(dispatcher._handlers) == 2
assert not self.events
assert (element.guard, UML.Constraint.specification) in list(
dispatcher._handlers.keys()), list(dispatcher._handlers.keys())
g.specification = 'x'
assert len(self.events) == 1, self.events
g.specification = 'a'
assert len(self.events) == 2, self.events
