Add mock test for settings window

ts/test-mock/settings/settings_test.ts

@@ -0,0 +1,44 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import createDebug from 'debug';
+
+import * as durations from '../../util/durations';
+import type { App } from '../playwright';
+import { Bootstrap } from '../bootstrap';
+
+export const debug = createDebug('mock:test:settings');
+
+describe('settings', function (this: Mocha.Suite) {
+  this.timeout(durations.MINUTE);
+
+  let bootstrap: Bootstrap;
+  let app: App;
+
+  beforeEach(async () => {
+    bootstrap = new Bootstrap();
+    await bootstrap.init();
+    app = await bootstrap.link();
+  });
+
+  afterEach(async function (this: Mocha.Context) {
+    if (!bootstrap) {
+      return;
+    }
+
+    await bootstrap.maybeSaveLogs(this.currentTest, app);
+    await app.close();
+    await bootstrap.teardown();
+  });
+
+  it('settings window loads when opened', async () => {
+    const window = await app.getWindow();
+
+    const newPagePromise = window.context().waitForEvent('page');
+    await window.locator('.NavTabs__ItemIcon--Settings').click();
+    const settingsWindow = await newPagePromise;
+
+    await settingsWindow.getByText('Appearance').click();
+    await settingsWindow.getByText('Language').first().waitFor();
+  });
+});