use super::*;
#[test]
fn never_signals_need_no_cancellation_registration() {
let never = Cancellation::never();
assert!(never.is_never());
assert!(never.clone().is_never());
assert!(!never.child().is_never());
let token = Cancellation::new();
assert!(!token.is_never());
token.cancel();
assert!(!token.is_never());
}
#[test]
fn dropped_children_release_their_registrations_and_ancestors() {
let root = Cancellation::new();
let node = root.node.as_ref().unwrap();
for _ in 0..100 {
let child = root.child();
let grandchild = child.child();
drop(child);
drop(grandchild);
assert!(node.children.lock().unwrap().is_empty());
assert_eq!(Arc::strong_count(node), 1);
}
}
#[test]
fn an_exclusively_owned_deep_chain_is_released_without_recursive_destruction() {
std::thread::Builder::new()
.stack_size(64 * 1024)
.spawn(|| {
let root = Cancellation::new();
let weak = Arc::downgrade(root.node.as_ref().unwrap());
let mut leaf = root.clone();
for _ in 0..10_000 {
leaf = leaf.child();
}
drop(root);
assert!(weak.upgrade().is_some());
drop(leaf);
assert!(weak.upgrade().is_none());
})
.unwrap()
.join()
.unwrap();
}