def on_trial(self, date):

        if self.trial_end:
            return date <= self.trial_end
        return False
L{Message.log} calls the given logger's C{write} method with a
dataset/ETHPy150Open PressLabs/silver/silver/models.py/Subscription.on_trial--crossover with--dataset/ETHPy150Open ClusterHQ/eliot/eliot/tests/test_message.py/MessageTests.test_logCallsDefaultLoggerWrite