gecko-dev/toolkit/xre/test/browser_checkdllblockliststate.js

// Any copyright is dedicated to the Public Domain.
// http://creativecommons.org/publicdomain/zero/1.0/

// Tests that the dll blocklist initializes correctly during test runs.
add_task(async function test() {
  await BrowserTestUtils.withNewTab({gBrowser, url: "about:blank" }, function(browser) {
    ok(Services.appinfo.windowsDLLBlocklistStatus,
       "Windows dll blocklist status should be true, indicating it is " +
       "running properly. A failure in this test is considered a " +
       "release blocker.");
  });
});