mirror of https://github.com/tc39/test262.git
39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
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// Copyright (C) 2023 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-array.fromasync
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description: >
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Promise is rejected if length property on an instance of a custom this-value
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is non-writable
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info: |
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3.j.ii.4.a. Perform ? Set(_A_, *"length"*, 𝔽(_k_), *true*).
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...
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3.k.viii. Perform ? Set(_A_, *"length"*, 𝔽(_len_), *true*).
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Note that there is no difference between strict mode and sloppy mode, because
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we are not following runtime evaluation semantics.
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includes: [asyncHelpers.js]
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flags: [async]
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features: [Array.fromAsync]
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---*/
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asyncTest(async function () {
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function MyArray() {
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Object.defineProperty(this, "length", {
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enumerable: true,
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writable: false,
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configurable: true,
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value: 99
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});
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}
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await assert.throwsAsync(TypeError, () => Array.fromAsync.call(MyArray, [0, 1, 2]), "Setting read-only length fails");
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await assert.throwsAsync(TypeError, () => Array.fromAsync.call(MyArray, {
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length: 3,
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0: 0,
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1: 1,
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2: 2
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}), "Setting read-only length fails in array-like case");
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});
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