zulip/frontend_tests/node_tests/support.js

const fs = require("fs");
const {JSDOM} = require("jsdom");
const template = fs.readFileSync("templates/analytics/realm_details.html", "utf-8");
const dom = new JSDOM(template, {pretendToBeVisual: true});
const document = dom.window.document;

let jquery_init;
global.$ = (f) => {
    jquery_init = f;
};
zrequire("support", "js/analytics/support");
set_global("$", global.make_zjquery());

run_test("scrub_realm", () => {
    jquery_init();
    const click_handler = $("body").get_on_handler("click", ".scrub-realm-button");
    assert.equal(typeof click_handler, "function");

    assert.equal(document.querySelectorAll(".scrub-realm-button").length, 1);
});