Hi Mark,
I did a quick look at GitHub issues, and there doesn't seem to be an equivalent issue up there (always helpful for another set of eyes to scan through, though). More information will undoubtedly be helpful, though (versions, etc.) — I believe there's a template that will open when you go to file an issue in the GitHub repo.
Have you tried running your testing scripts as a background job?
Bob Rudis has a nice demo: