invalid-realm.window.js

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This test has a WPT meta file that expects 4 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /encoding/streams/invalid-realm.window.html - WPT Dashboard Interop Dashboard

// Text*Stream should still work even if the realm is detached.

// Adds an iframe to the document and returns it.

function addIframe() {

  const iframe = document.createElement('iframe');

  document.body.appendChild(iframe);

  return iframe;

promise_test(async t => {

  const iframe = addIframe();

  const stream = new iframe.contentWindow.TextDecoderStream();

  const readPromise = stream.readable.getReader().read();

  const writer = stream.writable.getWriter();

  await writer.ready;

  iframe.remove();

  return Promise.all([writer.write(new Uint8Array([65])),readPromise]);

}, 'TextDecoderStream: write in detached realm should succeed');

promise_test(async t => {

  const iframe = addIframe();

  const stream = new iframe.contentWindow.TextEncoderStream();

  const readPromise = stream.readable.getReader().read();

  const writer = stream.writable.getWriter();

  await writer.ready;

  iframe.remove();

  return Promise.all([writer.write('A'), readPromise]);

}, 'TextEncoderStream: write in detached realm should succeed');

for (const type of ['TextEncoderStream', 'TextDecoderStream']) {

  promise_test(async t => {

    const iframe = addIframe();

    const stream = new iframe.contentWindow[type]();

    iframe.remove();

    return stream.writable.close();

  }, `${type}: close in detached realm should succeed`);