2 unstable releases
0.6.2 | Jan 25, 2024 |
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0.6.1 |
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0.6.0 |
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0.5.1 | Jan 16, 2024 |
0.5.0 |
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#303 in Testing
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12KB
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test-pretty-log
test-pretty-log is a crate that takes care of automatically initializing logging and/or tracing for Rust tests.
It is based off test-log and enables the logs to use pretty colors! :3
Note that this crate has removed support for log
and focuses entirely on
tracing
. Re-introducing support for log
is planned at a later date.
Usage
The crate provides a custom #[test]
attribute that, when used for
running a particular test, takes care of initializing tracing
beforehand.
Example
As such, usage is as simple as importing and using said attribute:
use test_pretty_log::test;
#[test]
fn it_works() {
info!("Checking whether it still works...");
assert_eq!(2 + 2, 4);
info!("Looks good!");
}
It is of course also possible to initialize logging for a chosen set of tests, by only annotating these with the custom attribute:
#[test_pretty_log::test]
fn it_still_works() {
// ...
}
You can also stack another attribute. For example, suppose you use
[#[tokio::test]
][tokio-test] to run async tests:
use test_log::test;
#[test(tokio::test)]
async fn it_still_works() {
// ...
}
Lastly, you can disable coloring for a test with a parameter:
use test_log::test;
#[test(color=false)]
fn no_more_colored_output() {
// :blobfoxsad:
}
Logging Configuration
As usual when running cargo test
, the output is captured by the
framework by default and only shown on test failure. The --nocapture
argument can be supplied in order to overwrite this setting. E.g.,
$ cargo test -- --nocapture
Furthermore, the RUST_LOG
environment variable is honored and can be
used to influence the log level to work with (among other things).
Please refer to the [env_logger
docs][env-docs-rs] for more
information.
The RUST_LOG_SPAN_EVENTS
environment variable can be used to configure
the tracing subscriber to log synthesized events at points in the span lifecycle.
Set the variable to a comma-separated list of events you want to see.
For example, RUST_LOG_SPAN_EVENTS=full
or RUST_LOG_SPAN_EVENTS=new,close
.
Valid events are new
, enter
, exit
, close
, active
, and full
.
See the [tracing_subscriber
docs][tracing-events-docs-rs] for details
on what the events mean.
The RUST_LOG_COLOR
environment variable can be used to
configure outputting ANSI colors in the tracing subscriber to print
colorized logs. By default, this is enabled. Valid values are common
boolean representations (f
, false
, off
, 0
, t
, true
, on
, 1
).
The color
parameter of the macro overrides this setting.
The RUST_LOG_FORMAT
environment variable can be used to configure
the formatter of the tracing subcriber. By default, it is set to pretty
.
Valid values are pretty
, full
, or compact
.
Dependencies
~4–6.5MB
~104K SLoC