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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/unshift/set-length-array-length-is-non-writable.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/unshift/set-length-array-length-is-non-writable.js | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/unshift/set-length-array-length-is-non-writable.js b/js/src/tests/test262/built-ins/Array/prototype/unshift/set-length-array-length-is-non-writable.js new file mode 100644 index 0000000000..9ce38b5d93 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/unshift/set-length-array-length-is-non-writable.js @@ -0,0 +1,50 @@ +// Copyright (C) 2022 Apple Inc. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. +/*--- +esid: sec-array.prototype.unshift +description: > + A TypeError is thrown when "length" is [[Set]] on an array with non-writable "length". +info: | + Array.prototype.unshift ( ...items ) + + [...] + 4. If argCount > 0, then + [...] + d. Let j be +0𝔽. + e. For each element E of items, do + i. Perform ? Set(O, ! ToString(j), E, true). + ii. Set j to j + 1𝔽. + 5. Perform ? Set(O, "length", 𝔽(len + argCount), true). + + OrdinarySetWithOwnDescriptor ( O, P, V, Receiver, ownDesc ) + + [...] + 2. If IsDataDescriptor(ownDesc) is true, then + a. If ownDesc.[[Writable]] is false, return false. + + Set ( O, P, V, Throw ) + + [...] + 1. Let success be ? O.[[Set]](P, V, O). + 2. If success is false and Throw is true, throw a TypeError exception. +---*/ + +var array = []; +var arrayPrototypeSet0Calls = 0; + +Object.defineProperty(Array.prototype, "0", { + set(_val) { + Object.defineProperty(array, "length", { writable: false }); + arrayPrototypeSet0Calls++; + }, +}); + +assert.throws(TypeError, function() { + array.unshift(1); +}); + +assert(!array.hasOwnProperty(0)); +assert.sameValue(array.length, 0); +assert.sameValue(arrayPrototypeSet0Calls, 1); + +reportCompare(0, 0); |