Strict mode Failing
Expected no error, got ESHostError: Expected a StopUnshift but got a TypeError
non-Strict mode Failing
Expected no error, got ESHostError: Expected a StopUnshift but got a TypeError
Features:
- ∅
Expected no error, got ESHostError: Expected a StopUnshift but got a TypeError
Expected no error, got ESHostError: Expected a StopUnshift but got a TypeError
// Copyright (C) 2017 André Bargull. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.unshift
description: >
Test properties are correctly accessed when length property is near 2^53-1.
info: |
2. Let len be ? ToLength(? Get(O, "length")).
3. Let argCount be the number of actual arguments.
4. If argCount > 0, then
...
b. Let k be len.
c. Repeat, while k > 0,
i. Let from be ! ToString(k-1).
ii. Let to be ! ToString(k+argCount-1).
iii. Let fromPresent be ? HasProperty(O, from).
iv. If fromPresent is true, then
1. Let fromValue be ? Get(O, from).
2. Perform ? Set(O, to, fromValue, true).
v. Else fromPresent is false,
1. Perform ? DeletePropertyOrThrow(O, to).
vi. Decrease k by 1.
features: [exponentiation]
---*/
function StopUnshift() {}
var arrayLike = {
get "9007199254740986" () {
throw new StopUnshift();
},
"9007199254740987": "9007199254740987",
/* "9007199254740988": hole */
"9007199254740989": "9007199254740989",
/* "9007199254740990": empty */
"9007199254740991": "9007199254740991",
length: 2 ** 53 - 2
};
assert.throws(StopUnshift, function() {
Array.prototype.unshift.call(arrayLike, null);
});
assert.sameValue(arrayLike.length, 2 ** 53 - 2,
"arrayLike.length is unchanged");
assert.sameValue(arrayLike["9007199254740987"], "9007199254740987",
"arrayLike['9007199254740987'] is unchanged");
assert.sameValue(arrayLike["9007199254740988"], "9007199254740987",
"arrayLike['9007199254740988'] is replaced with arrayLike['9007199254740987']");
assert.sameValue("9007199254740989" in arrayLike, false,
"arrayLike['9007199254740989'] is removed");
assert.sameValue(arrayLike["9007199254740990"], "9007199254740989",
"arrayLike['9007199254740990'] is replaced with arrayLike['9007199254740989']");
assert.sameValue(arrayLike["9007199254740991"], "9007199254740991",
"arrayLike['9007199254740991'] is unchanged");