mirror of https://github.com/tc39/test262.git
123 lines
2.7 KiB
JavaScript
123 lines
2.7 KiB
JavaScript
// Copyright (C) 2022 Chengzhong Wu. 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-wrappedfunctioncreate
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description: >
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The value of WrappedFunction.name is copied from the target function
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info: |
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WrappedFunctionCreate ( callerRealm: a Realm Record, Target: a function object, )
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...
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7. Let result be CopyNameAndLength(wrapped, Target).
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...
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CopyNameAndLength ( F: a function object, Target: a function object, prefix: a String, optional argCount: a Number, )
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1. If argCount is undefined, then set argCount to 0.
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2. Let L be 0.
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3. Let targetHasLength be ? HasOwnProperty(Target, "length").
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4. If targetHasLength is true, then
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a. Let targetLen be ? Get(Target, "length").
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b. If Type(targetLen) is Number, then
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i. If targetLen is +∞𝔽, set L to +∞.
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ii. Else if targetLen is -∞𝔽, set L to 0.
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iii. Else,
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1. Let targetLenAsInt be ! ToIntegerOrInfinity(targetLen).
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2. Assert: targetLenAsInt is finite.
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3. Set L to max(targetLenAsInt - argCount, 0).
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5. Perform ! SetFunctionLength(F, L).
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...
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SetFunctionLength ( F, length )
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...
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2. Return ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
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includes: [propertyHelper.js]
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features: [ShadowRealm]
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---*/
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assert.sameValue(
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typeof ShadowRealm.prototype.evaluate,
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'function',
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'This test must fail if ShadowRealm.prototype.evaluate is not a function'
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);
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const r = new ShadowRealm();
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let wrapped = r.evaluate(`
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function fn(foo, bar) {}
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fn;
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`);
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verifyProperty(wrapped, "length", {
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value: 2,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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wrapped = r.evaluate(`
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function fn() {}
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delete fn.length;
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fn;
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`);
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verifyProperty(wrapped, "length", {
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value: 0,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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wrapped = r.evaluate(`
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function fn() {}
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Object.defineProperty(fn, 'length', {
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get: () => Infinity,
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enumerable: false,
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configurable: true,
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});
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fn;
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`);
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verifyProperty(wrapped, "length", {
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value: Infinity,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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wrapped = r.evaluate(`
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function fn() {}
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Object.defineProperty(fn, 'length', {
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get: () => -Infinity,
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enumerable: false,
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configurable: true,
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});
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fn;
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`);
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verifyProperty(wrapped, "length", {
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value: 0,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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wrapped = r.evaluate(`
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function fn() {}
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Object.defineProperty(fn, 'length', {
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get: () => -1,
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enumerable: false,
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configurable: true,
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});
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fn;
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`);
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verifyProperty(wrapped, "length", {
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value: 0,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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