Sorry for the delay.
Not sure why does the tests module have to be globally installed. Is there any hard requirement for that? Ideally there should be no difference between locally-installed module and the one that’s installed globally.
You could try disabling the virtualenv and seeing if that helps to get the tests running. As I suggest here, you could do the following:
dependencies:
pre:
- grep -v "activate" ~/.circlerc > ~/.circlerc
Could you please try that out?