Class Receiver

tests/migrate_signals/tests.py:24–32

class Receiver:
    def __init__(self, signal):
        self.call_counter = 0
        self.call_args = None
        signal.connect(self, sender=APP_CONFIG)

    def __call__(self, signal, sender, **kwargs):
        self.call_counter += 1
        self.call_args = kwargs


class OneTimeReceiver: