def test_signal_emit_single_connection(args, kwargs):
callback = MagicMock()
signal = Signal()
signal.connect(callback)
signal.emit(*args, **kwargs)
callback.assert_called_once_with(*args, **kwargs)
def test_signal_emit_after_implicit_disconnect(args, kwargs):
def callback(): pass
signal = Signal()
signal.connect(callback, weak=True)
del callback
assert not signal.callbacks
signal.emit(*args, **kwargs)
def test_signal_emit_double_connection(args, kwargs):
callbacks = [MagicMock(), MagicMock()]
signal = Signal()
for callback in callbacks:
signal.connect(callback)
signal.emit(*args, **kwargs)
for callback in callbacks:
callback.assert_called_once_with(*args, **kwargs)
def test_signal_emit_multiple_connection(args, kwargs):
callback = MagicMock()
signal = Signal()
for _ in range(3):
signal.connect(callback)
signal.emit(*args, **kwargs)
assert callback.mock_calls == [
call(*args, **kwargs)
for _ in range(3)
]
def test_disconnect_during_emit(args, kwargs):
signal = Signal()
def remover(*args, **kwargs):
signal.disconnect(remover)
callbacks = [MagicMock(), remover, MagicMock(), MagicMock()]
for callback in callbacks:
signal.connect(callback)
signal.emit(*args, **kwargs)
for callback in callbacks:
if callback is not remover:
callback.assert_called_once_with(*args, **kwargs)
def test_simultaneous_emit(args, kwargs):
callback = MagicMock()
signal = Signal()
signal.connect(callback)
num_threads = 20
threads = [
Thread(target=signal.emit, args=args, kwargs=kwargs)
for _ in range(num_threads)
]
for thread in threads:
thread.start()
for thread in threads:
thread.join()
assert callback.mock_calls == [
call(*args, **kwargs)
for _ in range(num_threads)
]
def test_signal_emit_after_disconnect(args, kwargs):
cb = MagicMock()
def callback(*args, **kwargs):
cb(*args, **kwargs)
signal = Signal()
signal.connect(callback)
signal.disconnect(callback)
signal.emit(*args, **kwargs)
assert cb.mock_calls == []
def test_signal_emit_no_connection(args, kwargs):
signal = Signal()
signal.emit(*args, **kwargs)