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test_basic.py
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test_basic.py
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from unittest import mock
import pytest
from whistle import Event, EventDispatcher
STRING_EVENT_ID = '42'
OBJECT_EVENT_ID = object()
NUMERIC_EVENT_ID = 42
STRING_PARAMETER = 'str'
INTEGER_PARAMETER = 42
OBJECT_PARAMETER = object()
class CustomEvent(Event):
pass
def test_event():
event = Event()
assert not event.propagation_stopped
event.stop_propagation()
assert event.propagation_stopped
@pytest.mark.parametrize('event_id', [STRING_EVENT_ID, OBJECT_EVENT_ID, NUMERIC_EVENT_ID])
def test_dispatcher(event_id):
dispatcher = EventDispatcher()
listener = mock.MagicMock()
assert not dispatcher.has_listeners(event_id)
dispatcher.add_listener(event_id, listener)
assert dispatcher.has_listeners(event_id)
assert listener.call_count == 0
e = dispatcher.dispatch(event_id)
assert listener.call_count == 1
assert not e.propagation_stopped
e = dispatcher.dispatch(event_id)
assert listener.call_count == 2
assert not e.propagation_stopped
@pytest.mark.parametrize('EventType', [Event, CustomEvent])
@pytest.mark.parametrize('event_id', [STRING_EVENT_ID, OBJECT_EVENT_ID, NUMERIC_EVENT_ID])
def test_dispatcher_custom_event(EventType, event_id):
dispatcher = EventDispatcher()
listener = mock.MagicMock()
event = EventType()
dispatcher.add_listener(event_id, listener)
e = dispatcher.dispatch(event_id, event=event)
assert listener.call_count == 1
assert e == event
@pytest.mark.parametrize('event_id', [STRING_EVENT_ID, OBJECT_EVENT_ID, NUMERIC_EVENT_ID])
@pytest.mark.parametrize('param_1', [STRING_PARAMETER, INTEGER_PARAMETER, OBJECT_PARAMETER])
@pytest.mark.parametrize('param_2', [STRING_PARAMETER, INTEGER_PARAMETER, OBJECT_PARAMETER])
def test_dispatcher_with_args(event_id, param_1, param_2):
dispatcher = EventDispatcher()
listener = mock.MagicMock()
dispatcher.add_listener(event_id, listener)
e = dispatcher.dispatch(event_id, param_1, param_2)
assert listener.call_count == 1
assert (listener.call_args) == ((e, param_1, param_2),)
@pytest.mark.parametrize('EventType', [Event, CustomEvent])
@pytest.mark.parametrize('event_id', [STRING_EVENT_ID, OBJECT_EVENT_ID, NUMERIC_EVENT_ID])
@pytest.mark.parametrize('param_1', [STRING_PARAMETER, INTEGER_PARAMETER, OBJECT_PARAMETER])
@pytest.mark.parametrize('param_2', [STRING_PARAMETER, INTEGER_PARAMETER, OBJECT_PARAMETER])
def test_dispatcher_custom_event_with_args(EventType, event_id, param_1, param_2):
dispatcher = EventDispatcher()
listener = mock.MagicMock()
event = EventType()
dispatcher.add_listener(event_id, listener)
e = dispatcher.dispatch(event_id, param_1, param_2, event=event)
assert listener.call_count == 1
assert (listener.call_args) == ((e, param_1, param_2),)
def test_propagation():
dispatcher = EventDispatcher()
for event_id in (
STRING_EVENT_ID,
OBJECT_EVENT_ID,
NUMERIC_EVENT_ID,
):
listener1 = mock.MagicMock()
def listener2(event):
event.stop_propagation()
listener3 = mock.MagicMock()
dispatcher.add_listener(event_id, listener1)
dispatcher.add_listener(event_id, listener2)
dispatcher.add_listener(event_id, listener3)
assert listener1.call_count == 0
assert listener3.call_count == 0
e = dispatcher.dispatch(event_id)
assert listener1.call_count == 1
assert listener3.call_count == 0
assert e.propagation_stopped
e = dispatcher.dispatch(event_id)
assert listener1.call_count == 2
assert listener3.call_count == 0
assert e.propagation_stopped
assert dispatcher.get_listeners(event_id) == [listener1, listener2, listener3]
listeners = dispatcher.get_listeners()
assert len(listeners) == 3
for event_id in (
STRING_EVENT_ID,
OBJECT_EVENT_ID,
NUMERIC_EVENT_ID,
):
assert len(listeners[event_id]) == 3
def test_no_listener():
dispatcher = EventDispatcher()
for event_id in (
STRING_EVENT_ID,
OBJECT_EVENT_ID,
NUMERIC_EVENT_ID,
):
assert not dispatcher.has_listeners(event_id)
e = dispatcher.dispatch(event_id)
assert not e.propagation_stopped
def test_remove_listener():
dispatcher = EventDispatcher()
for event_id in (
STRING_EVENT_ID,
OBJECT_EVENT_ID,
NUMERIC_EVENT_ID,
):
listener = mock.MagicMock()
assert not dispatcher.has_listeners(event_id)
dispatcher.remove_listener(event_id, listener)
assert not dispatcher.has_listeners(event_id)
dispatcher.add_listener(event_id, listener)
assert dispatcher.has_listeners(event_id)
assert listener.call_count == 0
e = dispatcher.dispatch(event_id)
assert listener.call_count == 1
assert not e.propagation_stopped
assert dispatcher.has_listeners(event_id)
dispatcher.remove_listener(event_id, listener)
assert not dispatcher.has_listeners(event_id)
e = dispatcher.dispatch(event_id)
assert listener.call_count == 1
assert not e.propagation_stopped
def test_listen_decorator():
dispatcher = EventDispatcher()
for event_id in (
STRING_EVENT_ID,
OBJECT_EVENT_ID,
NUMERIC_EVENT_ID,
):
listener = mock.MagicMock()
dispatcher.listen(event_id)(listener)
e = dispatcher.dispatch(event_id)
assert listener.call_count == 1
assert not e.propagation_stopped