Welcome to the advanced stage of automated testing! In this lesson, we will delve into end-to-end user journey testing. This type of testing simulates real-world scenarios that a user might go through when interacting with an application. Our focus will be on an e-commerce application, where you will walk through the entire process of browsing, selecting, and purchasing a product, among other actions.

Building on your existing Playwright and TypeScript knowledge, you will now learn to craft tests that cover complex user interactions across various parts of an application.

During this lesson, you'll acquire skills to automate the full user journey on an e-commerce platform using Playwright. By the end of this lesson, you will be able to:

• Navigate through different pages of an application, such as login, product selection, checkout, and user account.
• Simulate interactions like adding a product to the cart and verifying user login status.
• Validate the presence of elements on different pages to ensure seamless user experiences.

Here’s a quick glimpse of the journey test you’ll be working on:

TypeScript
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1import { test, expect } from '@playwright/test';
2
3test('end-to-end user purchase journey', async ({ page, context }) => {
4  await page.goto('http://localhost:3000'); // Open the homepage
5  
6  // Navigate to login page and perform login
7  await page.click('text=🔑 Login'); 
8  await page.fill('#username', 'user1');
9  await page.fill('#password', 'pass1');
10  await page.click('text=Submit');
11  
12  // Verify user is logged in successfully
13  await expect(page.locator('text=Welcome to the BookStore')).toBeVisible();
14  
15  // Add book to cart
16  await page.locator('button:has-text("Add to Cart")').nth(1).click();
17  
18  // Go to cart and verify item addition
19  await page.click('text=🛒');
20  await expect(page.locator('text=To Kill a Mockingbird')).toBeVisible();
21  
22  // Navigate to account page and verify element presence
23  const [newPage] = await Promise.all([
24    context.waitForEvent('page'),
25    page.click('text=👤 Account')
26  ]);
27  await newPage.waitForLoadState();
28  await expect(newPage.locator('text=Your Account')).toBeVisible(); 
29});

End-to-end testing is crucial because it ensures that the application works as intended from the user's perspective. It helps identify errors that occur only when different parts of the system interact, which is something unit tests might miss.

Understanding and implementing end-to-end tests means you are capable of catching critical bugs before they reach end-users, thereby enhancing the reliability of your application. This not only improves the user experience but also boosts confidence among stakeholders regarding the stability of the software.

Are you excited to bring all these components together and ensure a seamless user journey in your e-commerce application? Let's dive into the practice section and start implementing these end-to-end tests!