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#![allow(clippy::unnecessary_operation)]
#![warn(rust_2018_idioms)]
#![cfg(feature = "sync")]
#[cfg(tokio_wasm_not_wasi)]
use wasm_bindgen_test::wasm_bindgen_test as test;
use tokio::sync::Barrier;
use tokio_test::task::spawn;
use tokio_test::{assert_pending, assert_ready};
struct IsSend<T: Send>(T);
#[test]
fn barrier_future_is_send() {
let b = Barrier::new(0);
IsSend(b.wait());
}
#[test]
fn zero_does_not_block() {
let b = Barrier::new(0);
{
let mut w = spawn(b.wait());
let wr = assert_ready!(w.poll());
assert!(wr.is_leader());
}
{
let mut w = spawn(b.wait());
let wr = assert_ready!(w.poll());
assert!(wr.is_leader());
}
}
#[test]
fn single() {
let b = Barrier::new(1);
{
let mut w = spawn(b.wait());
let wr = assert_ready!(w.poll());
assert!(wr.is_leader());
}
{
let mut w = spawn(b.wait());
let wr = assert_ready!(w.poll());
assert!(wr.is_leader());
}
{
let mut w = spawn(b.wait());
let wr = assert_ready!(w.poll());
assert!(wr.is_leader());
}
}
#[test]
fn tango() {
let b = Barrier::new(2);
let mut w1 = spawn(b.wait());
assert_pending!(w1.poll());
let mut w2 = spawn(b.wait());
let wr2 = assert_ready!(w2.poll());
let wr1 = assert_ready!(w1.poll());
assert!(wr1.is_leader() || wr2.is_leader());
assert!(!(wr1.is_leader() && wr2.is_leader()));
}
#[test]
fn lots() {
let b = Barrier::new(100);
for _ in 0..10 {
let mut wait = Vec::new();
for _ in 0..99 {
let mut w = spawn(b.wait());
assert_pending!(w.poll());
wait.push(w);
}
for w in &mut wait {
assert_pending!(w.poll());
}
// pass the barrier
let mut w = spawn(b.wait());
let mut found_leader = assert_ready!(w.poll()).is_leader();
for mut w in wait {
let wr = assert_ready!(w.poll());
if wr.is_leader() {
assert!(!found_leader);
found_leader = true;
}
}
assert!(found_leader);
}
}