def test_that_dispatcher_calls_before_handler(self):
before = mock.Mock()
dispatcher = eventhandler.Dispatcher(before_handler=before)
dispatcher.dispatch_event({'type': 'event_type'})
before.assert_called_once_with()
def test_that_dispatcher_loads_event_defs_and_dispatches(self):
event = {'type': 'event_type', 'payload': 'some payload'}
dispatcher = eventhandler.Dispatcher()
dispatcher.dispatch_event(event)
self.handler.assert_called_once_with(event)
def test_that_dispatcher_calls_before_handler_once_for_each_event(self):
eventhandler.HANDLERS = {'event_type': [self.handler, self.handler]}
before = mock.Mock()
dispatcher = eventhandler.Dispatcher(before_handler=before)
dispatcher.dispatch_event({'type': 'event_type'})
before.assert_called_once_with()
def test_that_before_handler_absorbs_exceptions_when_told_to_do_so(self):
before = mock.Mock(side_effect=RuntimeError)
dispatcher = eventhandler.Dispatcher(before_handler=before,
ignore_handler_exceptions=True)
dispatcher.dispatch_event({'type': 'event_type'})
before.assert_called_once_with()
self.assertTrue(True) # Wouldn't be reached unless Error was caught
def test_that_dispatcher_dispatches_to_multiple_handlers(self):
other_handler = mock.Mock(__name__='other_handler')
eventhandler.HANDLERS = {'event_type': [self.handler, other_handler]}
event = {'type': 'event_type', 'payload': 'some payload'}
dispatcher = eventhandler.Dispatcher()
dispatcher.dispatch_event(event)
self.handler.assert_called_once_with(event)
other_handler.assert_called_once_with(event)
def test_that_dispatcher_absorbs_all_exceptions_when_told_to_do_so(self):
handler = mock.Mock(__name__='my_handler')
handler.side_effect = RuntimeError
eventhandler.HANDLERS = {'event_type': [handler, self.handler]}
event = {'type': 'event_type', 'payload': 'some payload'}
dispatcher = eventhandler.Dispatcher(ignore_handler_exceptions=True)
dispatcher.dispatch_event(event)
self.handler.assert_called_once_with(event)
def test_that_dispatcher_does_not_absorb_handler_exceptions(self):
handler = mock.Mock(__name__='my_handler')
handler.side_effect = RuntimeError
eventhandler.HANDLERS = {'event_type': [handler, self.handler]}
event = {'type': 'event_type', 'payload': 'some payload'}
dispatcher = eventhandler.Dispatcher()
with self.assertRaises(RuntimeError):
dispatcher.dispatch_event(event)
def test_that_handler_can_not_change_event_data_for_other_handlers(self):
def first_handler(event):
event['data'] = 'changed'
eventhandler.HANDLERS = {'event_type': [first_handler, self.handler]}
dispatcher = eventhandler.Dispatcher()
event_tochange = {'type': 'event_type', 'data': 'not_changed'}
dispatcher.dispatch_event(event_tochange)
expected_handler_argument = self.handler.mock_calls[0][1][0]
self.assertEqual(expected_handler_argument, {
'type': 'event_type',
'data': 'not_changed'
})
def test_that_dispatcher_raises_error_if_event_has_no_type(self):
dispatcher = eventhandler.Dispatcher()
with self.assertRaises(RuntimeError):
dispatcher.dispatch_event({})
def test_that_before_handler_does_not_absorb_exceptions(self):
before = mock.Mock(side_effect=RuntimeError)
dispatcher = eventhandler.Dispatcher(before_handler=before)
self.assertRaises(RuntimeError, dispatcher.dispatch_event,
{'type': 'event_type'})
def test_that_dispatcher_absorbs_events_without_handler(self):
event = {'type': 'unknown_type', 'payload': 'some payload'}
dispatcher = eventhandler.Dispatcher()
dispatcher.dispatch_event(event)
self.assertEqual(len(self.handler.mock_calls), 0)
def test_that_dispatcher_does_not_raise_error_if_event_has_no_type_when_told_to(
self):
dispatcher = eventhandler.Dispatcher(error_on_missing_type=False)
dispatcher.dispatch_event({})
self.assertEqual(len(self.handler.mock_calls), 0)
