Limit tasks per worker

I can't seem to find any support to control the number of tasks a worker is allowed to process. I am thinking something similar to maxtasksperchild when creating a pool https://docs.python.org/2/library/multiprocessing.html#module-multiprocessing.pool.

Some of my tests use a library the uses gobal data structures that will conflict across tests. Is there an option for one worker per test?