JSTests/test262/test/language/expressions/object/fn-name-gen.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es6id: 12.2.6.9
description: >
    Assignment of function `name` attribute (GeneratorExpression)
info: |
    6. If IsAnonymousFunctionDefinition(AssignmentExpression) is true, then
       a. Let hasNameProperty be HasOwnProperty(propValue, "name").
       b. ReturnIfAbrupt(hasNameProperty).
       c. If hasNameProperty is false, perform SetFunctionName(propValue,
          propKey).
includes: [propertyHelper.js]
features: [generators, Symbol]
---*/

var namedSym = Symbol('test262');
var anonSym = Symbol();
var o;

o = {
  xId: function* x() {},
  id: function*() {},
  [anonSym]: function*() {},
  [namedSym]: function*() {}
};

assert(o.xId.name !== 'xId');

assert.sameValue(o.id.name, 'id', 'via IdentifierName');
verifyNotEnumerable(o.id, 'name');
verifyNotWritable(o.id, 'name');
verifyConfigurable(o.id, 'name');

assert.sameValue(o[anonSym].name, '', 'via anonymous Symbol');
verifyNotEnumerable(o[anonSym], 'name');
verifyNotWritable(o[anonSym], 'name');
verifyConfigurable(o[anonSym], 'name');

assert.sameValue(o[namedSym].name, '[test262]', 'via Symbol');
verifyNotEnumerable(o[namedSym], 'name');
verifyNotWritable(o[namedSym], 'name');
verifyConfigurable(o[namedSym], 'name');