I'm sorry for keeping you waiting for so long.
You still need an instance on which to raise the event. Raising the event on all existing timers is likely impractical. I suggest that you use the arrangement on the new expression to get the instance on which to raise the event, like so:
Timer timer =
Timer()).DoInstead((Timer thisTimer) => timer = thisTimer);
// first, do the thing that creates the timer
// we now have a reference to the timer from the above DoInstead clause
Mock.Raise(() => timer.TheEvent +=
In the above code I get the reference to the created timer using future constructor mocking. Then, I can raise the event on the instance regularly.
I hope this is enough to get your test running.
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