Tests have suddenly become extremely slow. I can't tell if they fail because they never seem to finish: <img width="542" alt="Screen Shot 2019-12-05 at 3 22 45 PM" src="https://user-images.githubusercontent.com/24194258/70198251-3a005680-1773-11ea-898a-b48cdd4a977c.png"> not sure how long this goes on for, but at least half an hour I think...