| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 19.1.2.1 |
| description: Invoked with a source which does not have a descriptor for an own property |
| info: | |
| [...] |
| 5. For each element nextSource of sources, in ascending index order, |
| [...] |
| c. Repeat for each element nextKey of keys in List order, |
| i. Let desc be from.[[GetOwnProperty]](nextKey). |
| ii. ReturnIfAbrupt(desc). |
| iii. if desc is not undefined and desc.[[Enumerable]] is true, then |
| features: [Proxy] |
| ---*/ |
| |
| var callCount = 0; |
| var target = {}; |
| var result; |
| var source = new Proxy({}, { |
| ownKeys: function() { |
| callCount += 1; |
| return ['missing']; |
| } |
| }); |
| |
| result = Object.assign(target, source); |
| |
| assert.sameValue(callCount, 1, 'Proxy trap was invoked exactly once'); |
| assert.sameValue( |
| Object.hasOwnProperty.call(target, 'missing'), |
| false, |
| 'An own property was not created for a property without a property descriptor' |
| ); |
| assert.sameValue(result, target); |
