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Written by knutaf on 2025-01-19 at 04:51

i'm trying to add #tracing (like the crate called tracing) to my current #rust project. i'm using tracing-forest to get nested output for my spans, and i want to get that into all my 200+ tests, but i don't want to add a new line to every test. a single global initializer before all tests run would be great, or else a per-test initializer would be fine. i've found some partial solutions, but nothing that lets me use tracing-forest in a layer. any ideas what I could do?

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Written by Marsh Ray on 2025-01-19 at 05:21

@knutaf I’m interested in this too.

Have you looked at the test-log crate?

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Written by knutaf on 2025-01-19 at 06:30

@marshray yeah, I glanced at it. It doesn't seem to let me customize my subscriber, is the thing.

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Written by Marsh Ray on 2025-01-19 at 07:26

@knutaf I did some checking. Custom test frameworks show no sign of progress to becoming stable rust.

Whatever it is that crate is doing, you’ll probably have to repurpose or replicate it.

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Written by Ben Kimock on 2025-01-22 at 06:30

@knutaf I think you are looking for https://crates.io/crates/ctor

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Written by knutaf on 2025-01-23 at 17:16

@saethlin thanks. i saw this but the restrictions seemed pretty serious, especially since i don't know what all the tracing code depends on. i suppose i could try to get a no-std version of it, but it felt limiting.

"The code that runs in the ctor and dtor functions should be careful to limit itself to libc functions and code that does not rely on Rust's stdlib services."

i ended up redefining my tests using a macro_rules that incorporates the tracing init code

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