I updated from pants 2.16.0a0 to 2.16.0a1 and now some of my pants plugin tests are showing wonky errors (like complaining about the syntax

: str

in a dataclass) for a

VenvPex

my rule is running. So, I want to debug this - how can I set

--keep-sandboxes=on_failure

for something running via pytest + rule_runner? I can get in the pytest sandbox, but I want to see the individual test's rule_runner's sandbox.

Ugh yeah, debugging pants-in-pants is always a bit of a pain. I usually modify the test as you suggest

Adding

rule_runner.set_options(["--keep-sandboxes=always"])

doesn't seem to be doing the trick. The path shown in the traceback doesn't exist 😕

https://github.com/StackStorm/st2/actions/runs/4577090796/jobs/8082076631?pr=5950#step:7:229 might be relevant