Probably more just the potential that the machine running the tests may coincidentally have something running on 9753.

Unlikely enough that I don't think it's worth worrying about some kind of dynamic search for an open port at this point, but maybe worth at least extracting the hard-coded value to a function in a re-usable namespace, so that we can use it in other tests going forward, and change the implementation of the function later if needed.

Just an idea, though.  I think I'd slightly prefer that, but would be fine with this being merged as-is if you guys don't think that's necessary.