I'm super not a fan of using mock expectations in a `before` hook, for a couple reasons:

* It means multiple examples would fail if the message is not received, and the focus of those examples is not on that message being received, so it's a confusing failure.  For example, the `it "prevents changes to the seed"` example is focused on something entirely different, and not on the `srand` message being received, and it really shouldn't pass/fail based on that.
* If it's so important that the message is received that you make it a mock expectation, then I want it called out in an example, like `it "seeds the random number generator only once"`.