js/src/tests/test262/built-ins/Promise/prototype/then/ctor-undef.js


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// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 25.4.5.3
description: >
    The Promise built-in is used when the `this` value has no `constructor` property
info: |
    1. Let promise be the this value.
    2. If IsPromise(promise) is false, throw a TypeError exception.
    3. Let C be SpeciesConstructor(promise, %Promise%).
    4. ReturnIfAbrupt(C).
    5. Let resultCapability be NewPromiseCapability(C).
---*/

var p1 = new Promise(function() {});
delete p1.constructor;

var p2 = p1.then();

assert(p2 instanceof Promise);

reportCompare(0, 0);