browser_thumbnails_capture_parent_process.js

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/* Any copyright is dedicated to the Public Domain.

   http://creativecommons.org/publicdomain/zero/1.0/ */

/**

 * These tests ensure that capturing a sites's thumbnail, saving it and

 * retrieving it from the cache works, specifically for a parent process.

*/

add_task(async function thumbnails_capture() {

  // Create a parent process tab with a red background.

  // We do this by creating a parent process, then we update it to be a red page,

  // before attempting to read the page colour.

  await BrowserTestUtils.withNewTab(

      gBrowser,

      // about:robots seems to be an simple parent process url we can test against,

      // but any parent process url would have worked, example, about:home or about:config

      url: "about:robots",

},

    async browser => {

      // Because about:robots is not generally a predictable testable page,

      // we update its background to something we can test against.

      browser.contentDocument.body.innerHTML = "";

      browser.contentDocument.body.style.backgroundColor = "#ff0000";

      await captureAndCheckColor(255, 0, 0, "we have a red thumbnail");

);

});