v8/test/mjsunit/string-wrapper.js
cbruni a6fd69ac29 [elements] Add more tests to increase coverage
BUG=

Review URL: https://codereview.chromium.org/1873833002

Cr-Commit-Position: refs/heads/master@{#35371}
2016-04-11 08:28:18 +00:00

63 lines
1.6 KiB
JavaScript

// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
var limit = 10000;
function testStringWrapper(string) {
assertEquals('a', string[0]);
assertEquals('b', string[1]);
assertEquals('c', string[2]);
}
(function testFastStringWrapperGrow() {
var string = new String("abc");
for (var i = 0; i < limit; i += 2) {
string[i] = {};
}
testStringWrapper(string);
for (var i = limit; i > 0; i -= 2) {
delete string[i];
}
testStringWrapper(string);
})();
(function testSlowStringWrapperGrow() {
var string = new String("abc");
// Force Slow String Wrapper Elements Kind
string[limit] = limit;
for (var i = 0; i < limit; i += 2) {
string[i] = {};
}
testStringWrapper(string);
assertEquals(limit, string[limit]);
for (var i = limit; i > 0; i -= 2) {
delete string[i];
}
testStringWrapper(string);
assertEquals(undefined, string[limit]);
})();
(function testReconfigureStringWrapperElements() {
var s = new String('abc');
// Can't reconfigure string contents.
assertThrows(() => Object.defineProperty(s, '1', {value: "value"}), TypeError);
// Configure a property outside the string range
var value = 'v1';
Object.defineProperty(s, '3', {
get: () => {return value},
configurable:true
});
assertEquals('v1', s[3]);
value = 'v2';
assertEquals('v2', s[3]);
Object.defineProperty(s, '3', {value: 'v3', configurable: false});
assertEquals('v3', s[3]);
assertThrows(() => Object.defineProperty(s, '3', {value:2}), TypeError);
})();