mirror of https://github.com/tc39/test262.git
Add tests for known violation of invariants (#841)
Some popular JavaScript engines display violation of invariants about property attributes for some non-standard but “web-reality” object properties. Add tests against such violations Closes #653 Fixes #649
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// Copyright (C) 2017 Claude Pache. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-invariants-of-the-essential-internal-methods
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es6id: 6.1.7.3
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description: >
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Value of non-writable, non-configurable data property must not change
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("arguments" property of a non-strict function)
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info: |
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[[GetOwnProperty]] (P)
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[...]
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- If a property P is described as a data property with Desc.[[Value]] equal
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to v and Desc.[[Writable]] and Desc.[[Configurable]] are both false, then
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the SameValue must be returned for the Desc.[[Value]] attribute of the
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property on all future calls to [[GetOwnProperty]] ( P ).
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[...]
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(This invariant was violated for the specific property under test by a number
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of implementations as of January 2017.)
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---*/
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function f() {
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return Reflect.getOwnPropertyDescriptor(f, 'arguments');
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}
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Reflect.defineProperty(f, 'arguments', { writable: false, configurable: false });
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var desc = Reflect.getOwnPropertyDescriptor(f, 'arguments');
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if (desc && desc.configurable === false && desc.writable === false) {
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var desc2 = f();
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assert.sameValue(desc.value, desc2.value);
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}
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// Copyright (C) 2017 Claude Pache. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-invariants-of-the-essential-internal-methods
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es6id: 6.1.7.3
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description: >
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Value of non-writable, non-configurable data property must not change
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("caller" property of a non-strict function)
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info: |
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[[GetOwnProperty]] (P)
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[...]
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- If a property P is described as a data property with Desc.[[Value]] equal
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to v and Desc.[[Writable]] and Desc.[[Configurable]] are both false, then
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the SameValue must be returned for the Desc.[[Value]] attribute of the
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property on all future calls to [[GetOwnProperty]] ( P ).
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[...]
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(This invariant was violated for the specific property under test by a number
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of implementations as of January 2017.)
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---*/
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function f() {
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return Reflect.getOwnPropertyDescriptor(f, 'caller');
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}
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function g() {
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return f();
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}
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Reflect.defineProperty(f, 'caller', { writable: false, configurable: false });
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var desc = Reflect.getOwnPropertyDescriptor(f, 'caller');
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if (desc && desc.configurable === false && desc.writable === false) {
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var desc2 = g();
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assert.sameValue(desc.value, desc2.value);
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}
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// Copyright (C) 2017 Claude Pache. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-invariants-of-the-essential-internal-methods
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es6id: 6.1.7.3
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description: >
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Value of non-writable, non-configurable data property must not change
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("$1" property of the RegExp built-in)
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info: |
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[[GetOwnProperty]] (P)
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[...]
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- If a property P is described as a data property with Desc.[[Value]] equal
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to v and Desc.[[Writable]] and Desc.[[Configurable]] are both false, then
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the SameValue must be returned for the Desc.[[Value]] attribute of the
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property on all future calls to [[GetOwnProperty]] ( P ).
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[...]
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(This invariant was violated for the specific property under test by at least
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one implementation as of January 2017.)
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---*/
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Reflect.defineProperty(RegExp, '$1', { writable: false, configurable: false });
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var desc = Reflect.getOwnPropertyDescriptor(RegExp, '$1');
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if (desc && desc.configurable === false && desc.writable === false) {
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/(x)/.exec('x');
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var desc2 = Reflect.getOwnPropertyDescriptor(RegExp, '$1');
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assert.sameValue(desc.value, desc2.value);
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}
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// Copyright (C) 2017 Claude Pache. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-invariants-of-the-essential-internal-methods
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es6id: 6.1.7.3
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description: >
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A property made non-writable, non-configurable must not be reported as writable
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("$1" property of the RegExp built-in)
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info: |
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[[GetOwnProperty]] (P)
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[...]
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- If the [[Writable]] attribute may change from false to true,
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then the [[Configurable]] attribute must be true..
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[...]
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(This invariant was violated for the specific property under test by at least
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one implementation as of January 2017.)
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---*/
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if (Reflect.defineProperty(RegExp, '$1', { writable: false, configurable: false })) {
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var desc = Reflect.getOwnPropertyDescriptor(RegExp, '$1');
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assert.sameValue(desc.writable, false);
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}
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