[benesch]

> in many CI environments unit tests don't have network access, it's not purely a price consideration.

I've never seen a hard block on network access (how do you install packages/pull images?) but I am sympathetic to wanting to enforce that unit tests run quickly by minimizing/eliminating RTT to networked services.

We've considered the possibility of a local simulator before. Let me know if it winds up being a blocker for your use case.

[lambda]

> how do you install packages/pull images

You pre-build the images with packages installed beforehand, then use those image offline.

[benesch]

My point is it's enough of a hassle to set up that I've yet to see that level of restriction in practice (across hundreds of CI systems).

[enigmo]

you pull packages from a trusted package repository, not from the internet. this is not rare in my experience (financial services, security) and will become increasingly common due to software supply chain issues.