Update Electron app E2E tests

e2e/app.test.ts

@@ -1,22 +1,26 @@
 import { test, expect } from '@playwright/test';
 import packageJson from '../package.json';
-import { launchApp } from './e2e-helpers';
-import type { ElectronApplication, Page } from 'playwright';
+import { E2ESession } from './e2e-helpers';
+import Onboarding from './page-objects/onboarding';
 
 test.describe( 'Electron app', () => {
-	let electronApp: ElectronApplication;
-	let mainWindow: Page;
+	const session = new E2ESession();
 
 	test.beforeAll( async () => {
-		[ electronApp, mainWindow ] = await launchApp();
+		await session.launch();
 	} );
 
 	test.afterAll( async () => {
-		await electronApp?.close();
+		await session.cleanup();
 	} );
 
 	test( 'should ensure app title is correct.', async () => {
-		const title = await mainWindow.title();
+		const title = await session.mainWindow.title();
 		expect( title ).toBe( packageJson.productName );
 	} );
+
+	test( 'first screen displayed is onboarding', async () => {
+		const onboarding = new Onboarding( session.mainWindow );
+		await expect( onboarding.heading ).toBeVisible();
+	} );
 } );