added simple integration test for hds-register-event

showcase/tests/integration/modifiers/hds-register-event-test.js

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import { module, test } from 'qunit';
+import { setupRenderingTest } from 'ember-qunit';
+import { click, render } from '@ember/test-helpers';
+import { hbs } from 'ember-cli-htmlbars';
+
+module('Integration | Modifier | hds-register-event', function (hooks) {
+  setupRenderingTest(hooks);
+
+  test('it calls the callback associated with the `click` event assigned via the modifier', async function (assert) {
+    let clicked;
+    this.set('onClick', () => (clicked = true));
+    await render(
+      hbs`<button id="test-button" {{hds-register-event 'click' this.onClick}}>Test</button>`
+    );
+    await click('button#test-button');
+    assert.true(clicked);
+  });
+});