mirror of https://github.com/tc39/test262.git
51 lines
1.5 KiB
JavaScript
51 lines
1.5 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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esid: sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget
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description: >
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If the construct trap value is undefined, propagate the construct to the target object.
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info: |
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[[Construct]] (argumentsList, newTarget)
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...
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5. Let trap be ? GetMethod(handler, "construct").
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6. If trap is undefined, then
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a. Assert: target has a [[Construct]] internal method.
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b. Return ? Construct(target, argumentsList, newTarget).
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...
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GetMethod ( V, P )
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...
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3. If func is either undefined or null, return undefined.
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...
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features: [Proxy, Reflect, Reflect.construct]
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---*/
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var calls = 0;
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var _NewTarget;
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var Target = new Proxy(function() {
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throw new Test262Error('target should not be called');
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}, {
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construct: function(_Target, args, NewTarget) {
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calls += 1;
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_NewTarget = NewTarget;
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return {
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sum: args[0] + args[1]
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};
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},
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});
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var P = new Proxy(Target, {
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construct: undefined
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});
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var NewTarget = function() {};
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var obj = Reflect.construct(P, [3, 4], NewTarget);
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assert.sameValue(calls, 1, "construct is undefined: [[Construct]] is invoked once");
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assert.sameValue(_NewTarget, NewTarget, "construct is undefined: NewTarget is passed to [[Construct]]");
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assert.sameValue(obj.sum, 7, "construct is undefined: result of [[Construct]] is returned");
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