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