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async function loadIframeAndReturnContentWindow() {
// Create and attach an iframe.
const iframe = document.createElement('iframe');
const iframeLoadPromise = new Promise((resolve, reject) => {
iframe.onload = resolve;
iframe.onerror = reject;
});
document.body.append(iframe);
await iframeLoadPromise;
return iframe.contentWindow;
}
// This is a regression test to ensure there is no crash inside `takeUntil()`
// once `notifier` detaches its document, before `source` is subscribed to.
promise_test(async () => {
// Hang this off of the main document's global, so the child can easily reach
// it.
window.results = [];
const contentWin = await loadIframeAndReturnContentWindow();
contentWin.eval(`
const parentResults = parent.results;
const source = new Observable(() => parentResults.push('source subscribed'));
const notifier = new Observable(() => {
parentResults.push('notifier subscribed');
// Detach this child document.
window.frameElement.remove();
parentResults.push('notifier has detached document');
});
source.takeUntil(notifier).subscribe();
`);
assert_array_equals(results, ["notifier subscribed", "notifier has detached document"]);
}, "takeUntil(): notifier Observable detaches document before source " +
"Observable would be subscribed to");
promise_test(async () => {
window.results = [];
const contentWin = await loadIframeAndReturnContentWindow();
contentWin.eval(`
let completeSubscriber, errorSubscriber, notifierSubscriber;
const sourceComplete = new Observable(subscriber => completeSubscriber = subscriber);
const sourceError = new Observable(subscriber => errorSubscriber = subscriber);
const notifier = new Observable(subscriber => notifierSubscriber = subscriber);
sourceComplete.takeUntil(notifier).subscribe();
sourceError.takeUntil(notifier).subscribe();
// Detach this child document.
window.frameElement.remove();
completeSubscriber.complete();
errorSubscriber.error('error');
notifierSubscriber.error('error');
`);
}, "takeUntil(): Source and notifier internal observers do not crash in a " +
"detached document");
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