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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/fromAsync/this-constructor-with-readonly-length.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/fromAsync/this-constructor-with-readonly-length.js | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor-with-readonly-length.js b/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor-with-readonly-length.js new file mode 100644 index 0000000000..f5f9495004 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor-with-readonly-length.js @@ -0,0 +1,39 @@ +// |reftest| async +// Copyright (C) 2023 Igalia, S.L. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +esid: sec-array.fromasync +description: > + Promise is rejected if length property on an instance of a custom this-value + is non-writable +info: | + 3.j.ii.4.a. Perform ? Set(_A_, *"length"*, 𝔽(_k_), *true*). + ... + 3.k.viii. Perform ? Set(_A_, *"length"*, 𝔽(_len_), *true*). + + Note that there is no difference between strict mode and sloppy mode, because + we are not following runtime evaluation semantics. +includes: [asyncHelpers.js] +flags: [async] +features: [Array.fromAsync] +---*/ + +asyncTest(async function () { + function MyArray() { + Object.defineProperty(this, "length", { + enumerable: true, + writable: false, + configurable: true, + value: 99 + }); + } + + await assert.throwsAsync(TypeError, () => Array.fromAsync.call(MyArray, [0, 1, 2]), "Setting read-only length fails"); + await assert.throwsAsync(TypeError, () => Array.fromAsync.call(MyArray, { + length: 3, + 0: 0, + 1: 1, + 2: 2 + }), "Setting read-only length fails in array-like case"); +}); |