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[immutable-arraybuffer] tests for interaction between immutable ABs and base64 proposal #4998

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[immutable-arraybuffer] tests for interaction between immutable ABs and base64 proposal #4998

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19 changes: 19 additions & 0 deletions ...nt8Array/prototype/setFromBase64/throws-when-target-is-backed-by-immutable-arraybuffer.js
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Original file line number Diff line number Diff line change
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// Copyright (C) 2026 Kevin Gibbons. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-uint8array.prototype.setfrombase64
description: Uint8Array.prototype.setFromBase64 throws a TypeError when the target is backed by an immutable ArrayBuffer.
features: [ArrayBuffer, TypedArray, uint8array-base64, immutable-arraybuffer]
---*/

var iab = (new ArrayBuffer(10)).transferToImmutable();
var target = new Uint8Array(iab);

assert.throws(TypeError, function () {
target.setFromBase64('Zg==');
});

assert.throws(TypeError, function () {
target.setFromBase64('');
});
19 changes: 19 additions & 0 deletions .../Uint8Array/prototype/setFromHex/throws-when-target-is-backed-by-immutable-arraybuffer.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
// Copyright (C) 2026 Kevin Gibbons. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-uint8array.prototype.setfromhex
description: Uint8Array.prototype.setFromHex throws a TypeError when the target is backed by an immutable ArrayBuffer.
features: [ArrayBuffer, TypedArray, uint8array-base64, immutable-arraybuffer]
---*/

var iab = (new ArrayBuffer(10)).transferToImmutable();
var target = new Uint8Array(iab);

assert.throws(TypeError, function () {
target.setFromHex('aa');
});

assert.throws(TypeError, function () {
target.setFromHex('');
});
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