Effortless API Mocking with Playwright: A Step-by-Step Guide

Automated testing of web applications often requires interaction with external APIs. However, relying on actual API responses can introduce variables beyond your control, such as network issues or server downtime. This is where API mocking comes in. Mocking allows you to simulate API responses, making your tests more reliable and faster. In this article, we’ll explore how to mock APIs using Playwright with TypeScript.

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Mocking APIs in Playwright

Playwright provides a way to intercept network requests and mock responses using the route method. Let’s walk through an example where we mock an API response.

Step-by-Step Guide

1. Import the necessary modules + Create a basic test

import { test, expect, chromium } from '@playwright/test';

test('Mock User Profile API', async ({ page }) => {
    await page.goto('https://example.com/profile');
    // Mocking will be done here
});

2. Set up request interception and mocking:

test('Mock User Profile API', async ({ page }) => {
    // Scenario 1: Successful data retrieval
    await…