observable-map.window.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /dom/observable/tentative/observable-map.window.html - WPT Dashboard Interop Dashboard

async function loadIframeAndReturnContentWindow() {

   // Create and attach an iframe.

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

  const iframeLoadPromise = new Promise((resolve, reject) => {

    iframe.onload = resolve;

    iframe.onerror = reject;

});

  document.body.append(iframe);

  await iframeLoadPromise;

  return iframe.contentWindow;

promise_test(async t => {

  const contentWin = await loadIframeAndReturnContentWindow();

  window.results = [];

  contentWin.eval(`

    const parentResults = parent.results;

    const source = new Observable(subscriber => {

      // Detach the document before calling next().

      window.frameElement.remove();

      // This invokes the map() operator's internal observer's next steps,

      // which at least in Chromium, must have a special "context is detached"

      // check to early-return, so as to not crash before invoking the "mapper"

      // callback supplied to the map() operator.

      subscriber.next(1);

});

    source.map(value => {

      parentResults.push(value);

    }).subscribe(v => parentResults.push(v));

`);

  // If we got here, we didn't crash! Let's also check that `results` is empty.

  assert_array_equals(results, []);

}, "map()'s internal observer's next steps do not crash in a detached document");