trap-is-undefined-no-property.js (1468B)
1 // Copyright (C) 2015 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget 5 description: > 6 If the construct trap is not set, propagate the construct to the target object. 7 info: | 8 [[Construct]] (argumentsList, newTarget) 9 10 ... 11 5. Let trap be ? GetMethod(handler, "construct"). 12 6. If trap is undefined, then 13 a. Assert: target has a [[Construct]] internal method. 14 b. Return ? Construct(target, argumentsList, newTarget). 15 ... 16 17 GetMethod ( V, P ) 18 19 ... 20 3. If func is either undefined or null, return undefined. 21 ... 22 features: [Proxy, Reflect, Reflect.construct] 23 ---*/ 24 25 var calls = 0; 26 var _NewTarget; 27 28 var Target = new Proxy(function() { 29 throw new Test262Error('target should not be called'); 30 }, { 31 construct: function(_Target, args, NewTarget) { 32 calls += 1; 33 _NewTarget = NewTarget; 34 return { 35 sum: args[0] + args[1] 36 }; 37 } 38 }) 39 40 var P = new Proxy(Target, {}); 41 var NewTarget = function() {}; 42 var obj = Reflect.construct(P, [3, 4], NewTarget); 43 44 assert.sameValue(calls, 1, "construct is missing: [[Construct]] is invoked once"); 45 assert.sameValue(_NewTarget, NewTarget, "construct is missing: NewTarget is passed to [[Construct]]"); 46 assert.sameValue(obj.sum, 7, "construct is missing: result of [[Construct]] is returned"); 47 48 reportCompare(0, 0);