Revert "Delete upgrader-view.test.ts"

This reverts commit ab58499.

src/Umbraco.Web.UI.Client/src/apps/upgrader/upgrader-view.test.ts

@@ -0,0 +1,22 @@
+import { UmbUpgraderViewElement } from './upgrader-view.element.js';
+import { expect, fixture, html } from '@open-wc/testing';
+
+import { type UmbTestRunnerWindow, defaultA11yConfig } from '@umbraco-cms/internal/test-utils';
+
+describe('UmbUpgraderView', () => {
+	let element: UmbUpgraderViewElement;
+
+	beforeEach(async () => {
+		element = await fixture(html`<umb-upgrader-view></umb-upgrader-view>`);
+	});
+
+	it('is defined with its own instance', () => {
+		expect(element).to.be.instanceOf(UmbUpgraderViewElement);
+	});
+
+	if ((window as UmbTestRunnerWindow).__UMBRACO_TEST_RUN_A11Y_TEST) {
+		it('passes the a11y audit', async () => {
+			await expect(element).to.be.accessible(defaultA11yConfig);
+		});
+	}
+});