topology-aware: Add unit tests for resources

[ozhuraki]

No description provided.

[klihub]

@ozhuraki For the topology-aware policy, we should be careful with adding unit tests that exercise internal interfaces, as they inevitably add (even) more (than the currently existing) inertia against changes... including cleanups. And especially these bits in the topology-aware policy will probably need to be touched in the near future, so I think it probably would be better to hold back unit tests until after such changes have landed.

[ozhuraki]

@klihub

we should be careful with adding unit tests that exercise internal interfaces

OK, thanks. I have reworked to use only exported interfaces, PTAL. If yet too intrusive, we could hold.

[ozhuraki]

@klihub Thanks for the help! Updated, PTAL.