🎭 E2E Testing Strategies

Welcome to the E2E Testing Strategies tutorial! In this course, you'll learn how to design and implement end-to-end tests using Playwright — validating your application just like a real user would.

Prerequisites

We recommend completing the TDD Masterclass first to understand the fundamentals of test-driven development.

🎮 Experience E2E Testing Commands

E2E tests simulate real user interactions. Try these commands:

ECC Command Simulator

❯

Available Commands:

📚 Three-Step E2E Test Design

From User Journey to Playwright Test

Step 1 of 4

Step 1: Define the User Journey

E2E testing starts not with code, but with user stories. Imagine how a real user would use your application — from opening the page to achieving their goal. A user journey is like a "tour guide route map".

// User Journey: Login Flow
// 
// As a registered user,
// I want to log in to my account,
// So that I can access my dashboard.
//
// Steps:
// 1. Navigate to /login
// 2. Enter email in email field
// 3. Enter password in password field
// 4. Click "Login" button
// 5. Verify redirect to /dashboard
// 6. Verify welcome message shows username

💡Each user journey corresponds to one test() function. Write comments first, then code!

💻 Write Your First Playwright Test

Write a complete E2E test in the code playground. Try writing a user journey test for a search feature:

Playwright E2E Testtypescript

// tests/search.spec.ts
import { test, expect } from '@playwright/test'

// Page Object for Search
class SearchPage {
constructor(private page) {}

// Locators
get searchInput() {
  return this.page.getByPlaceholder('Search docs...')
}
get searchResults() {
  return this.page.getByTestId('search-results')
}
get resultItems() {
  return this.page.getByRole('listitem')
}
get noResults() {
  return this.page.getByText('No results found')
}

// Actions
async search(query: string) {
  await this.searchInput.fill(query)
  await this.searchInput.press('Enter')
}
}

// User Journey: Search Documentation
test.describe('Search Flow', () => {

test('should find results for valid query', async ({ page }) => {
  const searchPage = new SearchPage(page)
  await page.goto('/')

// User types a search query
  await searchPage.search('hooks')

// Should show relevant results
  await expect(searchPage.searchResults).toBeVisible()
  await expect(searchPage.resultItems).toHaveCount(3)
})

test('should show empty state for no results', async ({ page }) => {
  const searchPage = new SearchPage(page)
  await page.goto('/')

// User types a query with no matches
  await searchPage.search('xyznonexistent')

// Should show friendly empty state
  await expect(searchPage.noResults).toBeVisible()
})

// Try adding more test cases:
// - Test keyboard navigation (Tab, Enter)
// - Test search suggestions/autocomplete
// - Test clearing search
})

❓ Knowledge Check

❓

What should be the first step in E2E testing?

AWrite Playwright test code

BCreate a Page Object

CDefine the user journey

DConfigure playwright.config.ts

❓

What is the biggest advantage of the Page Object pattern?

AMakes tests run faster

BReduces browser startup time

CEncapsulates page interactions into reusable interfaces, improving maintainability

DAuto-generates test cases

❓

Which Playwright selector is most recommended?

Apage.locator(".btn-primary")

Bpage.locator("#login-btn")

Cpage.getByRole("button", { name: "Login" })

Dpage.locator("div > form > button:nth-child(2)")

🎉 Congratulations!

You've completed the E2E Testing Strategies tutorial! You've mastered:

✅ User journey-driven test design
✅ Page Object pattern encapsulation
✅ Playwright test writing (AAA pattern)
✅ Network interception and visual regression
✅ Best selector strategies

📖 Next Steps

Multi-Agent Workflows - Learn agent orchestration
Custom Hooks Development - Create automation hooks
Advanced Topics: Performance - Dive into performance tuning

🎮 Experience E2E Testing Commands​

📚 Three-Step E2E Test Design​

From User Journey to Playwright Test

Step 1: Define the User Journey

💻 Write Your First Playwright Test​

❓ Knowledge Check​