Welcome back to another crucial component of e-commerce testing! In the previous lessons, we've focused on user journeys and product search functionalities using Playwright and TypeScript. Today, we will concentrate on validating the shopping cart updates. Ensuring the accuracy of shopping cart functionalities is essential because they form the core of any e-commerce transaction. Mismanagement in this area could lead to lost sales and frustrated customers. Let's dive in with a solid foundation from our past topics and further refine our testing skills.

In this lesson, you'll delve into the behaviors associated with adding, removing, and validating items in a shopping cart. You will:

• Develop an understanding of how to write end-to-end tests that manage shopping cart operations.
• Learn the significance of using Playwright's Page Object Model to interact with the shopping cart components.
• Explore how to verify cart visibility and accuracy to ensure a smooth shopping experience for users.

As a brief refresher, consider the following code snippet, illustrating how Playwright can be used to validate shopping cart updates with clarity and precision:

TypeScript
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1import { test, expect } from '@playwright/test';
2import { HomePage } from './pages/homePage';
3import { CartPage } from './pages/cartPage';
4
5test('validate shopping cart updates', async ({ page }) => {
6  const homePage = new HomePage(page);
7  const cartPage = new CartPage(page);
8
9  // Navigate to the home page and add the book to the cart
10  await homePage.goto();
11  await homePage.addToCart('The Great Gatsby');
12
13  // Navigate to the cart page and validate that the book is added
14  await cartPage.goto();
15  await cartPage.expectBookVisible('The Great Gatsby');
16
17  // Remove book from cart and confirm the cart is empty
18  await cartPage.removeBook('The Great Gatsby');
19  await cartPage.expectCartEmpty();
20});

This snippet outlines the steps, from adding a book to validating the cart contents, thus encapsulating a critical part of the e-commerce experience.

Here are the Page Object Models mentioned for the HomePage and CartPage:

TypeScript
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1import { Page } from '@playwright/test';
2
3export class HomePage {
4  readonly page: Page;
5
6  constructor(page: Page) {
7    this.page = page;
8  }
9
10  async goto() {
11    await this.page.goto('http://localhost:3000/home');
12  }
13
14  async addToCart(bookTitle: string) {
15    const bookSelector = `.book-title:text-is("${bookTitle}")`;
16    await this.page.locator(bookSelector).locator('..').locator('button:text("Add to Cart")').click();
17  }
18}

TypeScript
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1import { Page, expect } from '@playwright/test';
2
3export class CartPage {
4  readonly page: Page;
5
6  constructor(page: Page) {
7    this.page = page;
8  }
9
10  async goto() {
11    await this.page.goto('http://localhost:3000/cart');
12  }
13
14  async expectBookVisible(bookTitle: string) {
15    await expect(this.page.locator(`text=${bookTitle}`)).toBeVisible();
16  }
17
18  async removeBook(bookTitle: string) {
19    const removeButtonSelector = `li:has-text("${bookTitle}") >> text=Remove`;
20    await this.page.click(removeButtonSelector);
21  }
22
23  async expectCartEmpty() {
24    await expect(this.page.locator('text=Your cart is empty')).toBeVisible();
25  }
26}

Shopping cart validation is imperative for ensuring a seamless user experience in any online store. Imagine a scenario where users find discrepancies in their cart items — it results in lost trust and potential revenue. By mastering these end-to-end tests, you contribute to building reliable e-commerce applications that foster trust and boost customer satisfaction. Your skills in testing will pave the way for error-free transactions, enhancing the user's journey from selection to purchase.

Excited to see how you can transform the user experience? Let's prepare to move on to the practice section and apply what you've learned to ensure error-free shopping cart experiences.