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//! Tests for the raw write logging functionality.
use std::{
io,
sync::{
atomic::{AtomicBool, Ordering},
Arc,
},
};
use log::Level::*;
mod support;
use support::manual_log;
#[test]
fn test_raw_write_logging() {
struct TestWriter {
buf: Vec<u8>,
flag: Arc<AtomicBool>,
}
impl io::Write for TestWriter {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.buf.write(buf)
}
fn flush(&mut self) -> io::Result<()> {
self.buf.flush()?;
let expected = b"[INFO] Test information message\n";
if self.buf == expected {
self.flag.store(true, Ordering::SeqCst);
} else {
eprintln!("{:?} does not match {:?}", self.buf, expected);
}
Ok(())
}
}
let flag = Arc::new(AtomicBool::new(false));
// Create a basic logger configuration
let (_max_level, logger) = fern::Dispatch::new()
.format(|out, msg, record| out.finish(format_args!("[{}] {}", record.level(), msg)))
.level(log::LevelFilter::Info)
.chain(io::stdout())
.chain(Box::new(TestWriter {
buf: Vec::new(),
flag: flag.clone(),
}) as Box<dyn io::Write + Send>)
.into_log();
let l = &*logger;
manual_log(l, Info, "Test information message");
// ensure all File objects are dropped and OS buffers are flushed.
log::logger().flush();
assert!(
flag.load(Ordering::SeqCst),
"raw Write test failed: did not match buffer"
);
}
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