js/src/tests/test262/built-ins/Iterator/prototype/forEach/iterator-already-exhausted.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.forEach
description: >
  Iterator.prototype.forEach returns immediately when the iterator has already been exhausted
info: |
  %Iterator.prototype%.forEach ( fn )

features: [iterator-helpers]
flags: []
---*/
let iterator = (function* () {})();

let { value, done } = iterator.next();
assert.sameValue(value, undefined);
assert.sameValue(done, true);

let result = iterator.forEach(() => {
  throw new Error();
});
assert.sameValue(result, undefined);

reportCompare(0, 0);