test_ReadableStream_from.js

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

add_task(async function run_test() {

  let sb = new Cu.Sandbox('http://www.example.com');

  let done = false;

  let iterator = {

    [Symbol.asyncIterator]() {

      return this;

},

    next() {

      let promise = Cu.evalInSandbox(`Promise.resolve({done: ${done}, value: {hello: "world"}})`, sb);

      done = true;

      return promise;

  let stream = ReadableStream.from(iterator);

  let reader = stream.getReader();

  let result = await reader.read();

  Assert.equal(result.done, false);

  Assert.equal(result.value?.hello, "world");

  result = await reader.read();

  Assert.equal(result.done, true);

});