X3m.System.Test.Scheduler.dispatch

You're seeing just the function dispatch, go back to X3m.System.Test.Scheduler module for more information.
Link to this function

dispatch(msg, aggregate_id, list)

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Specs

dispatch(X3m.System.Message.t(), String.t(), opts :: Keyword.t()) :: :ok

Schedules dispatch of msg in given milliseconds or at given DateTime. It assigns :dispatch_at to the msg and that's the real DateTime when dispatch should occur.

opts can be either: