discourse/test/javascripts/acceptance/custom-html-template-test.js

import { acceptance } from "helpers/qunit-helpers";

acceptance("CustomHTML template", {
  beforeEach() {
    Ember.TEMPLATES["top"] = Ember.HTMLBars.compile(
      `<span class='top-span'>TOP</span>`
    );
  },

  afterEach() {
    delete Ember.TEMPLATES["top"];
  }
});

QUnit.test("renders custom template", async assert => {
  await visit("/static/faq");
  assert.equal(find("span.top-span").text(), "TOP", "it inserted the template");
});