Capture logs inside tests? about fern

[sourcefrog]

It seems something like this will work. If there's no simpler way could I suggest this be added to the examples?

fn install_test_logger() {
    // This'll fail if called twice; don't worry.
    let _ = fern::Dispatch::new()
        // ...
        .level(log::LevelFilter::Debug)
        .chain(fern::Output::call(|record| println!("{}", record.args())))
        .apply();
}```

[daboross]

Thanks! I hadn't realized that the test framework's hook was per-thread rather than global. Makes sense now that I think about it, though.

Adding that as an example sounds like a good idea. It might also be worth adding to this note as well (or we could just remove the stdout from this example; it isn't really relevant):

fern/src/builders.rs

Lines 691 to 701 in 6666bd2

	/// fern::Dispatch::new()
	/// // format, etc.
	/// .chain(std::io::stdout())
	/// .chain(
	/// fern::Dispatch::new()
	/// .level(log::LevelFilter::Error)
	/// .chain(fern::Panic),
	/// )
	/// # /*
	/// .apply()?;
	/// # */ .into_log();

.