def testDeletionIsSent(self):
pm = PropertyLayer(testkey="somevalue")
mock = Mock()
pm.wireProperty("testkey", mock.method)
mock.method.reset_mock()
del pm["testkey"]
mock.method.assert_called_once_with(PropertyDeleted)
def testSubscribeBeforeSet(self):
pm = PropertyLayer()
mock = Mock()
pm.wireProperty("testkey", mock.method)
mock.method.assert_not_called()
pm["testkey"] = "newvalue"
mock.method.assert_called_once_with("newvalue")
def testNoDeletionEventWhenPropertyDoesntExist(self):
pm = PropertyLayer(otherkey="somevalue")
mock = Mock()
pm.wireProperty("testkey", mock.method)
mock.method.reset_mock()
with self.assertRaises(KeyError):
del pm["testkey"]
mock.method.assert_not_called()
