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Added test where this value has read-only property #4902

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Added test where this value has read-only property #4902

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24 changes: 24 additions & 0 deletions test/built-ins/Array/prototype/unshift/read-only-property.js
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// Copyright (C) 2026 Garham Lee. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.unshift
description: >
Array.prototype.unshift throws TypeError when a property is read-only.
info: |
Array.prototype.unshift ( ..._items_ )

1. Let _O_ be ? ToObject(*this* value).
2. Let _len_ be ? LengthOfArrayLike(_O_).
3. Let _argCount_ be the number of elements in _items_.
4. If _argCount_ > 0, then
a. If _len_ + _argCount_ > 2<sup>53</sup> - 1, throw a *TypeError* exception.
b. Let _k_ be _len_.
c. Repeat, while _k_ > 0,
d. Let _j_ be *+0*<sub>𝔽</sub>.
e. For each element _E_ of _items_, do
i. Perform ? Set(_O_, ! ToString(_j_), _E_, *true*).
---*/
assert.throws(TypeError, function () {
Array.prototype.unshift.call({get 0 () {}}, 0)
}, "Array.prototype.unshift throws TypeError when a property is read-only.")
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