custom log format with date and line of code

[tkoeppen]

This crate is a good idea.
We have in our current tests a custom log format to log e.g. the line of code and the time.
We do this to easier debug and understand quicker, where tests fail.

2023-12-11T09:51:28.903Z  INFO module::api_tests 277: api_tests_007_authenticate_user start ...

init_logger() ...
tracing_subscriber::fmt()
    .with_timer(timer)
    .with_line_number(true)
    .with_writer(std::io::stdout)
    .with_env_filter(EnvFilter::from_default_env())
    .try_init();

Today we call in each test our own init_logger().

No idea, how to achieve the same log format with the test_log macro.
Is it possible to enhance the macro to support a custom log format?

[d-e-s-o]

Yeah, better customizability would be great. I thought about that in the past, but never found a good way to go about it.
If Rust had global attributes on stable, I'd say we could build something. But short of that the only way to even inject additional information that I can think of would be via environment variables. And I don't think that tracing-subscriber has syntax to influence any of what you are asking (and it would be fairly cumbersome to use, in my opinion).

[d-e-s-o]

Well...perhaps we could add a per-test attribute that accepts an initializer function to run and would invoke that instead of the default one. But really all that would do is give you a slightly more declarative syntax than what you have where you manually invoke init_logger() in each test.

[psionic-k]

Re-export from some utils crate within a project might be appropriate. We want to do that anyway since we end up using the same test dependencies a lot and re-exporting removes a lot of dependency boilerplate.

1. Create an augmented macro in utils
2. Import that proc macro instead in all test modules