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Diffstat (limited to 'js/src/tests/test262/built-ins/Array/length/define-own-prop-length-coercion-order.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/length/define-own-prop-length-coercion-order.js | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/length/define-own-prop-length-coercion-order.js b/js/src/tests/test262/built-ins/Array/length/define-own-prop-length-coercion-order.js new file mode 100644 index 0000000000..8c0f7a97a8 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/length/define-own-prop-length-coercion-order.js @@ -0,0 +1,63 @@ +// Copyright (C) 2020 Alexey Shvayka. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +author: André Bargull +esid: sec-arraysetlength +description: > + [[Value]] is coerced to number before descriptor validation. +info: | + ArraySetLength ( A, Desc ) + + [...] + 3. Let newLen be ? ToUint32(Desc.[[Value]]). + 4. Let numberLen be ? ToNumber(Desc.[[Value]]). + [...] + 7. Let oldLenDesc be OrdinaryGetOwnProperty(A, "length"). + [...] + 11. If newLen ≥ oldLen, then + a. Return OrdinaryDefineOwnProperty(A, "length", newLenDesc). + + OrdinaryDefineOwnProperty ( O, P, Desc ) + + [...] + 3. Return ValidateAndApplyPropertyDescriptor(O, P, extensible, Desc, current). + + ValidateAndApplyPropertyDescriptor ( O, P, extensible, Desc, current ) + + [...] + 7. Else if IsDataDescriptor(current) and IsDataDescriptor(Desc) are both true, then + a. If current.[[Configurable]] is false and current.[[Writable]] is false, then + i. If Desc.[[Writable]] is present and Desc.[[Writable]] is true, return false. +features: [Reflect] +---*/ + +var array = [1, 2]; +var valueOfCalls = 0; +var length = { + valueOf: function() { + valueOfCalls += 1; + if (valueOfCalls !== 1) { + // skip first coercion at step 3 + Object.defineProperty(array, "length", {writable: false}); + } + return array.length; + }, +}; + +assert.throws(TypeError, function() { + Object.defineProperty(array, "length", {value: length, writable: true}); +}, 'Object.defineProperty(array, "length", {value: length, writable: true}) throws a TypeError exception'); +assert.sameValue(valueOfCalls, 2, 'The value of valueOfCalls is expected to be 2'); + + +array = [1, 2]; +valueOfCalls = 0; + +assert( + !Reflect.defineProperty(array, "length", {value: length, writable: true}), + 'The value of !Reflect.defineProperty(array, "length", {value: length, writable: true}) is expected to be true' +); +assert.sameValue(valueOfCalls, 2, 'The value of valueOfCalls is expected to be 2'); + +reportCompare(0, 0); |