discourse/app/assets/javascripts/discourse/tests/integration/components/software-update-prompt-test.js

import { module, test } from "qunit";
import { setupRenderingTest } from "discourse/tests/helpers/component-test";
import { render } from "@ember/test-helpers";
import {
  count,
  exists,
  publishToMessageBus,
} from "discourse/tests/helpers/qunit-helpers";
import { hbs } from "ember-cli-htmlbars";
import { later } from "@ember/runloop";

module("Integration | Component | software-update-prompt", function (hooks) {
  setupRenderingTest(hooks);

  test("software-update-prompt gets correct CSS class after messageBus message", async function (assert) {
    await render(hbs`{{software-update-prompt}}`);

    assert.ok(
      !exists("div.software-update-prompt"),
      "it does not have the class to show the prompt"
    );

    publishToMessageBus("/global/asset-version", "somenewversion");

    const done = assert.async();
    later(() => {
      assert.strictEqual(
        count("div.software-update-prompt.require-software-refresh"),
        1,
        "it does have the class to show the prompt"
      );
      done();
    }, 10);
  });
});