Test amount of data movement between workers

https://github.com/dask/dask/pull/6491 try to introduce broadcasting tricks for zeros/ones/full which (should) decrease the amount of communications between workers.
https://github.com/dask/dask/pull/6343 test that "sizeof" give the base size instead of the full size.

Would a test in distributed that data-transfer is minimal be worth it in distributed ? And how would I do that ?