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Array length: add test ensuring RangeError is thrown #3974

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Jan 8, 2024
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24 changes: 24 additions & 0 deletions test/built-ins/Array/length/define-own-prop-length-error.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
// Copyright (C) 2023 Jordan Harband. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
author: Jordan Harband
esid: sec-arraysetlength
description: >
Setting an invalid array length throws a RangeError
info: |
ArraySetLength ( A, Desc )

[...]
5. If SameValueZero(newLen, numberLen) is false, throw a RangeError exception.
[...]
---*/

assert.throws(RangeError, function () {
Object.defineProperty([], 'length', { value: -1, configurable: true });
});

assert.throws(RangeError, function () {
// the string is intentionally "computed" here to ensure there are no optimization bugs
Object.defineProperty([], 'len' + 'gth', { value: -1, configurable: true });
});