"use strict"; const { AddonTestUtils } = ChromeUtils.importESModule( "resource://testing-common/AddonTestUtils.sys.mjs" ); AddonTestUtils.init(this); AddonTestUtils.createAppInfo( "xpcshell@tests.mozilla.org", "XPCShell", "42", "42" ); add_task(async function helper() { do_get_profile(); // The SearchService is also needed in order to construct the initial state, // which means that the AddonManager needs to be available. await AddonTestUtils.promiseStartupManager(); // The example.com domain will be used to host the dynamic layout JSON and // the top stories JSON. let server = AddonTestUtils.createHttpServer({ hosts: ["example.com"] }); server.registerDirectory("/", do_get_cwd()); Assert.equal(true, fetch instanceof Function); var k = await fetch("http://example.com/"); console.log(k); console.log(k.body); var r = k.body.getReader(); console.log(r); var v = await r.read(); console.log(v); });