invoke-resolve.js - mozsearch

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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.

/*---

description: >

    Invocation of the constructor's `resolve` method

es6id: 25.4.4.1

info: |

    11. Let result be PerformPromiseAll(iteratorRecord, C, promiseCapability).

    [...]

    25.4.4.1.1 Runtime Semantics: PerformPromiseAll

    [...]

    6. Repeat

        [...]

        i. Let nextPromise be Invoke(constructor, "resolve", «nextValue»).

---*/

var p1 = new Promise(function() {});

var p2 = new Promise(function() {});

var p3 = new Promise(function() {});

var resolve = Promise.resolve;

var callCount = 0;

var current = p1;

var next = p2;

var afterNext = p3;

Promise.resolve = function(nextValue) {

  assert.sameValue(

    nextValue, current, '`resolve` invoked with next iterated value'

);

  assert.sameValue(

    arguments.length, 1, '`resolve` invoked with a single argument'

);

  assert.sameValue(this, Promise, '`this` value is the constructor');

  current = next;

  next = afterNext;

  afterNext = null;

  callCount += 1;

  return resolve.apply(Promise, arguments);

};

Promise.all([p1, p2, p3]);

assert.sameValue(

  callCount, 3, '`resolve` invoked once for each iterated value'

);

reportCompare(0, 0);