v8/test/webkit/fast/js/Promise-static-cast.js

// Copyright 2014 the V8 project authors. All rights reserved.
// Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
//
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// modification, are permitted provided that the following conditions
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//     notice, this list of conditions and the following disclaimer.
// 2.  Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//
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// Flags: --harmony
'use strict';
description('Test Promise.resolve as cast');

var result = undefined;
var result2 = undefined;

var resolve;
var value = new Promise(function (r) { resolve = r;} );
var promise = Promise.resolve(value);

// If [[IsPromise]] is true, Promise.resolve simply returns argument.
shouldBe('promise', 'value');

promise.then(function(res) {
  result = res;
  shouldBeEqualToString('result', 'hello');

  return Promise.resolve(42).then(function (res) {
      result2 = res;
      shouldBe('result2', '42');
  });
}).then(function () {
  testPassed('fulfilled');
  finishJSTest();
}, function() {
  testFailed('rejected');
  finishJSTest();
});

resolve('hello');
shouldBe('result', 'undefined');
shouldBe('result2', 'undefined');