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//! Tests for the never channel flavor.
use std::thread;
use std::time::{Duration, Instant};
use crossbeam_channel::{never, select, tick, unbounded};
fn ms(ms: u64) -> Duration {
Duration::from_millis(ms)
}
#[test]
fn smoke() {
select! {
recv(never::<i32>()) -> _ => panic!(),
default => {}
}
}
#[test]
fn optional() {
let (s, r) = unbounded::<i32>();
s.send(1).unwrap();
s.send(2).unwrap();
let mut r = Some(&r);
select! {
recv(r.unwrap_or(&never())) -> _ => {}
default => panic!(),
}
r = None;
select! {
recv(r.unwrap_or(&never())) -> _ => panic!(),
default => {}
}
}
#[test]
fn tick_n() {
let mut r = tick(ms(100));
let mut step = 0;
loop {
select! {
recv(r) -> _ => step += 1,
default(ms(500)) => break,
}
if step == 10 {
r = never();
}
}
assert_eq!(step, 10);
}
#[test]
fn capacity() {
let r = never::<i32>();
assert_eq!(r.capacity(), Some(0));
}
#[test]
fn len_empty_full() {
let r = never::<i32>();
assert_eq!(r.len(), 0);
assert!(r.is_empty());
assert!(r.is_full());
}
#[test]
fn try_recv() {
let r = never::<i32>();
assert!(r.try_recv().is_err());
thread::sleep(ms(100));
assert!(r.try_recv().is_err());
}
#[test]
fn recv_timeout() {
let start = Instant::now();
let r = never::<i32>();
assert!(r.recv_timeout(ms(100)).is_err());
let now = Instant::now();
assert!(now - start >= ms(100));
assert!(now - start <= ms(150));
assert!(r.recv_timeout(ms(100)).is_err());
let now = Instant::now();
assert!(now - start >= ms(200));
assert!(now - start <= ms(250));
}