Reference library

Streaming & messaging

Kafka-style pub/sub, event consumers, async pipelines, and message-driven workflows.

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Streaming & messaging easy

At Most Once Fire-and-Forget Mock in Python

A Python mock that enforces send() is called at most once and records the arguments for verification.

fire-and-forget mock testing
Python 
class FireForgetMock:
    def __init__(self):
        self._calls = 0
        self._last_args = None
        self._last_kwargs = None

    def send(self, *args, **kwargs):
        if self._calls > 0:
            raise RuntimeError("send() called more than once")
        self._calls += 1
        self._last_args = args
…
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