I wouldn't have thought so, since the IO stack is entirely portable, at least from the Python side of things. This would have to have been a test that somehow knows about optional functions and notifies you if they're missing but without failing the run. I don't think that's feasible, at least in this case, since there's no way to know that the function should be there.

Potentially we could set up a test to ensure that we don't remove public functions by dumping a complete list, but that's beyond the scope of this one issue.