def testEventPreventedWhenValueUnchanged(self):
pm = PropertyLayer()
pm["testkey"] = "testvalue"
mock = Mock()
pm.wire(mock.method)
pm["testkey"] = "testvalue"
mock.method.assert_not_called()
def testSubscription(self):
pm = PropertyLayer()
pm["testkey"] = "before"
mock = Mock()
pm.wire(mock.method)
pm["testkey"] = "after"
mock.method.assert_called_once_with({"testkey": "after"})
def testUnsubscribe(self):
pm = PropertyLayer()
pm["testkey"] = "before"
mock = Mock()
sub = pm.wire(mock.method)
pm["testkey"] = "between"
mock.method.assert_called_once_with({"testkey": "between"})
mock.reset_mock()
pm.unwire(sub)
pm["testkey"] = "after"
mock.method.assert_not_called()
def testDeletionInGeneralWiring(self):
pm = PropertyLayer(testkey="somevalue")
mock = Mock()
pm.wire(mock.method)
del pm["testkey"]
mock.method.assert_called_once_with({"testkey": PropertyDeleted})
