DEV: prevents test timeout (#12631)

Clock manipulation seems not reliable in component tests. This blog post does a great job of explaining it: https://dockyard.com/blog/2018/04/18/bending-time-in-ember-tests

Sadly, we don't have all the "recent" ember test helpers and can't use things like `getSettledState()`.

For now this pattern seems the most reliable and easy to apply, albeit not great.

Note if you wish to reproduce the current timeout, the following command should do it: `QUNIT_SEED=215263717493121190480103670124734840282 rake qunit:test`

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

@@ -1,30 +1,19 @@
 import componentTest, {
   setupRenderingTest,
 } from "discourse/tests/helpers/component-test";
-import sinon from "sinon";
 import {
   discourseModule,
-  fakeTime,
   publishToMessageBus,
   queryAll,
 } from "discourse/tests/helpers/qunit-helpers";
 import hbs from "htmlbars-inline-precompile";
+import { later } from "@ember/runloop";
 
-let clock = null;
 discourseModule(
   "Integration | Component | software-update-prompt",
   function (hooks) {
     setupRenderingTest(hooks);
 
-    hooks.beforeEach(function () {
-      clock = fakeTime("2019-12-10T08:00:00", "Australia/Brisbane", true);
-    });
-
-    hooks.afterEach(function () {
-      clock.restore();
-      sinon.restore();
-    });
-
     componentTest(
       "software-update-prompt gets correct CSS class after messageBus message",
       {
@@ -36,6 +25,7 @@ discourseModule(
               .length === 0,
             "it does not have the class to show the prompt"
           );
+
           assert.equal(
             queryAll("div.software-update-prompt")[0].getAttribute(
               "aria-hidden"
@@ -46,13 +36,15 @@ discourseModule(
 
           publishToMessageBus("/global/asset-version", "somenewversion");
 
-          clock.tick(1000 * 60 * 24 * 60 + 10);
-
-          assert.ok(
-            queryAll("div.software-update-prompt.require-software-refresh")
-              .length === 1,
-            "it does have the class to show the prompt"
-          );
+          const done = assert.async();
+          later(() => {
+            assert.ok(
+              queryAll("div.software-update-prompt.require-software-refresh")
+                .length === 1,
+              "it does have the class to show the prompt"
+            );
+            done();
+          }, 10);
         },
       }
     );