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// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
//
//
/*---
esid: pending
description: Calling `throw` on a lazy %AsyncIterator.prototype% method closes the source iterator.
info: >
Iterator Helpers proposal 2.1.6
features: [iterator-helpers]
---*/
class TestError extends Error {}
class TestIterator extends AsyncIterator {
async next() {
return {done: false, value: 1};
}
closed = false;
async return(value) {
this.closed = true;
return {done: true, value};
}
}
async function* gen(x) { yield x; }
const methods = [
iter => iter.map(x => x),
iter => iter.filter(x => x),
iter => iter.take(1),
iter => iter.drop(0),
iter => iter.asIndexedPairs(),
iter => iter.flatMap(gen),
];
for (const method of methods) {
const iter = new TestIterator();
const iterHelper = method(iter);
assertEq(iter.closed, false);
iterHelper.throw(new TestError()).then(
_ => assertEq(true, false, 'Expected reject.'),
err => {
assertEq(err instanceof TestError, true);
assertEq(iter.closed, true);
iterHelper.next().then(({done, value}) => {
assertEq(done, true);
assertEq(value, undefined);
});
},
);
}
if (typeof reportCompare == 'function')
reportCompare(0, 0);
|
