tor-browser

The Tor Browser
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asyncitems-asynciterator-exists.js (1102B)

      1 // |reftest| async
      2 // Copyright (C) 2022 Igalia, S.L. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 
      5 /*---
      6 esid: sec-array.fromasync
      7 description: >
      8  Array.fromAsync tries the various properties in order
      9 includes: [asyncHelpers.js, compareArray.js, temporalHelpers.js]
     10 flags: [async]
     11 features: [Array.fromAsync]
     12 ---*/
     13 
     14 asyncTest(async function () {
     15  async function * asyncGen() {
     16    for (let i = 0; i < 4; i++) {
     17      yield Promise.resolve(i * 2);
     18    }
     19  }
     20 
     21  const actual = [];
     22  const items = {};
     23  TemporalHelpers.observeProperty(actual, items, Symbol.asyncIterator, asyncGen, "items");
     24  TemporalHelpers.observeProperty(actual, items, Symbol.iterator, undefined, "items");
     25  TemporalHelpers.observeProperty(actual, items, "length", 2, "items");
     26  TemporalHelpers.observeProperty(actual, items, 0, 2, "items");
     27  TemporalHelpers.observeProperty(actual, items, 1, 1, "items");
     28  const result = await Array.fromAsync(items);
     29  assert.compareArray(result, [0, 2, 4, 6]);
     30  assert.compareArray(actual, [
     31    "get items[Symbol.asyncIterator]",
     32  ]);
     33 });