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|
// |reftest| async
// Copyright (C) 2022 Chengzhong Wu. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-asyncgenerator-prototype-return
description: >
A broken promise should reject the returned promise of
AsyncGenerator.prototype.return when the generator is completed.
info: |
AsyncGenerator.prototype.return ( value )
...
8. If state is either suspendedStart or completed, then
a. Set generator.[[AsyncGeneratorState]] to awaiting-return.
b. Perform ! AsyncGeneratorAwaitReturn(generator).
...
AsyncGeneratorAwaitReturn ( generator )
...
6. Let promise be Completion(PromiseResolve(%Promise%, completion.[[Value]])).
7. If promiseCompletion is an abrupt completion, then
a. Set generator.[[AsyncGeneratorState]] to completed.
b. Perform AsyncGeneratorCompleteStep(generator, promiseCompletion, true).
c. Perform AsyncGeneratorDrainQueue(generator).
d. Return unused.
8. Assert: promiseCompletion.[[Type]] is normal.
9. Let promise be promiseCompletion.[[Value]].
...
flags: [async]
features: [async-iteration]
---*/
let unblock;
let blocking = new Promise(resolve => { unblock = resolve; });
let unblocked = false;
var g = async function*() {
await blocking;
unblocked = true;
};
var it = g();
let brokenPromise = Promise.resolve(42);
Object.defineProperty(brokenPromise, 'constructor', {
get: function () {
throw new Error('broken promise');
}
});
it.next();
it.return(brokenPromise)
.then(
() => {
throw new Test262Error("Expected rejection");
},
err => {
assert(unblocked, false, 'return should be rejected before generator is resumed');
assert.sameValue(err.message, 'broken promise');
}
)
.then($DONE, $DONE);
unblock();
|
