| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| description: Use of the value returned by the constructor's `resolve` method. |
| es6id: 25.4.4.1 |
| info: | |
| [...] |
| 6. Let promiseCapability be NewPromiseCapability(C). |
| [...] |
| 11. Let result be PerformPromiseRace(iteratorRecord, promiseCapability, C). |
| [...] |
| |
| 25.4.4.3.1 Runtime Semantics: PerformPromiseRace |
| |
| 1. Repeat |
| [...] |
| h. Let nextPromise be Invoke(C, "resolve", «nextValue»). |
| [...] |
| j. Let result be Invoke(nextPromise, "then", |
| «promiseCapability.[[Resolve]], promiseCapability.[[Reject]]»). |
| [...] |
| ---*/ |
| |
| var originalCallCount = 0; |
| var newCallCount = 0; |
| var P = function(executor) { |
| executor(function() {}, function() {}); |
| }; |
| P.resolve = function() { |
| return newThenable; |
| }; |
| |
| var originalThenable = { |
| then: function() { |
| originalCallCount += 1; |
| } |
| }; |
| var newThenable = { |
| then: function() { |
| newCallCount += 1; |
| } |
| }; |
| |
| Promise.race.call(P, [originalThenable]); |
| |
| assert.sameValue(originalCallCount, 0, 'original `then` method not invoked'); |
| assert.sameValue(newCallCount, 1, 'new `then` method invoked exactly once'); |