Stream: helpdesk (published)

Topic: How to test for errors in a subprocess

Simon Christ (Sep 09 2022 at 09:15):

I'd like to write something along the lines of

using Test
@test_throws DomainError run(`julia -e 'sqrt(-1)'`)

Is that possible somehow?

Sukera (Sep 09 2022 at 09:15):

no, because the DomainError doesn't make it to the spawning process

Sukera (Sep 09 2022 at 09:15):

it's handled by the spawned process, the only thing run ends up seeing is the exit code of the process

Sukera (Sep 09 2022 at 09:16):

when dealing with subprocesses, you're limited to what they're communicating outside, either via various output streams, an exit code or explicit communication

Sukera (Sep 09 2022 at 09:17):

what you can do is search for DomainError in the stdout/stderr of the spawned process, but that's not reliable due to other output possibly creating a false positive

Simon Christ (Sep 09 2022 at 09:19):

Thanks! I feared it would be like that..

Last updated: Oct 02 2023 at 04:34 UTC