added acceptance (a11y) test for foundations/theming page

Author: didoo

showcase/tests/acceptance/components/hds/theming-test.js

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) HashiCorp, Inc.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+
+import { module, test } from 'qunit';
+import { visit } from '@ember/test-helpers';
+import { setupApplicationTest } from 'showcase/tests/helpers';
+import { a11yAudit } from 'ember-a11y-testing/test-support';
+
+module('Acceptance | Foundations | hds/theming', function (hooks) {
+  setupApplicationTest(hooks);
+
+  test('Foundations/hds/theming page passes automated a11y checks', async function (assert) {
+    await visit('/foundations/theming');
+    await a11yAudit();
+
+    assert.ok(true, 'a11y automation audit passed');
+  });
+});