/language/expressions/await/await-non-promise-thenable.js Hermes test262 report

Strict mode Failing

Expected no error, got ESHostError: ESHostError: Expected [Promise: 1, Await: 1, Promise: 2, Await: 2, Promise: 3] and [Promise: 1, Promise: 2, Await: 1, Promise: 3, Promise: 4, Await: 2] to have the same contents. Async/await and promises should be interleaved

non-Strict mode Failing

Expected no error, got ESHostError: ESHostError: Expected [Promise: 1, Await: 1, Promise: 2, Await: 2, Promise: 3] and [Promise: 1, Promise: 2, Await: 1, Promise: 3, Promise: 4, Await: 2] to have the same contents. Async/await and promises should be interleaved

Features:

async-functions

Source code

// Copyright 2018 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
author: Maya Lekova <mslekova@chromium.org>
esid: await
description: >
  This test demonstrates that "then" on a non-native promise
  will still get called.
flags: [async]
features: [async-functions]
includes: [compareArray.js]
---*/

let thenCallCount = 0;

const actual = [];
const expected = [
  'Promise: 1',
  'Promise: 2',
  'Await: 1',
  'Promise: 3',
  'Promise: 4',
  'Await: 2',
];

const patched = {};
patched.then = function(fulfill, reject) {
  thenCallCount++;
  fulfill(thenCallCount);
};

async function trigger() {
  actual.push('Await: ' + await patched);
  actual.push('Await: ' + await patched);
}

function checkAssertions() {
  assert.compareArray(actual, expected,
    'Async/await and promises should be interleaved');
  assert.sameValue(thenCallCount, 2,
    '"then" on non-native promises should be called.');
}

trigger().then(checkAssertions).then($DONE, $DONE);

new Promise(function (resolve) {
  actual.push('Promise: 1');
  resolve();
}).then(function () {
  actual.push('Promise: 2');
}).then(function () {
  actual.push('Promise: 3');
}).then(function () {
  actual.push('Promise: 4');
});

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await-non-promise-thenable.js on GitHub