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To wait for the microtask queue to empty, our internal test helpers schedule an arbitrary task using `setImmediate`. It doesn't matter what kind of task it is, only that it's a separate task from the current one, because by the time it fires, the microtasks for the current event will have already been processed. The issue with `setImmediate` is that Jest mocks it. Which can lead to weird behavior. I've changed it to instead use a message event, via the MessageChannel implementation exposed by the `node:worker_threads` module. We should consider doing this in the public implementation of `act`, too.