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Testing track

Automation Testing Tutorial

Automate tests with Selenium, Playwright, xUnit, Jest and API tests — page objects, BDD, CI pipelines, flaky tests and performance testing.

Intermediate
Start: Introduction to Test Automation View all topics
0/24 complete
Topics
24
Full lessons
24
Est. hours
~4
Interview Qs
10

Overview

Test automation uses code to run checks repeatedly and reliably, so every change can be verified in minutes instead of days.

This track starts with what to automate and the test pyramid, then builds real suites with Selenium WebDriver and Playwright, unit tests with xUnit and Jest, API tests, BDD with Gherkin, and runs them all in CI with clear reports.

What you will learn

  • Choose what to automate using the test pyramid
  • Write reliable UI tests with Selenium and Playwright
  • Automate unit and API tests
  • Run suites in CI, report results and fix flaky tests

Prerequisites

You will get the most from this track if you already know:

Learning path

The recommended sequence, from beginner to advanced. Each stage builds on the one before.

  1. 1Foundations · 4 topics · Beginner
    Introduction to Test Automation · What to Automate · Test Automation Pyramid · Choosing a Framework
  2. 2Selenium WebDriver · 4 topics · Beginner → Intermediate
    Selenium WebDriver Setup · Locators · Waits · Page Object Model
  3. 3Playwright · 3 topics · Intermediate
    Playwright Fundamentals · Playwright Locators and Assertions · Playwright Test Runner
  4. 4Unit & API Tests · 4 topics · Intermediate
    Unit Testing with xUnit · Unit Testing with Jest · API Test Automation · Mocking and Test Doubles
  5. 5Professional Practice · 7 topics · Intermediate → Advanced
    Test Data Management · BDD with Gherkin · Cross-Browser Testing · Test Reporting · CI Integration · Flaky Tests · Performance Testing with k6
  6. 6Practice · 2 topics · Advanced
    Automation Framework Project · Interview Questions

Complete topic list

24 topics
1

Foundations

4 topics
  1. Introduction to Test AutomationBeginner5m
  2. What to AutomateBeginner5m
  3. Test Automation PyramidBeginner5m
  4. Choosing a FrameworkBeginner5m
2

Selenium WebDriver

4 topics
  1. Selenium WebDriver SetupBeginner5m
  2. LocatorsBeginner5m
  3. WaitsIntermediate5m
  4. Page Object ModelIntermediate5m
3

Playwright

3 topics
  1. Playwright FundamentalsIntermediate5m
  2. Playwright Locators and AssertionsIntermediate5m
  3. Playwright Test RunnerIntermediate5m
4

Unit & API Tests

4 topics
  1. Unit Testing with xUnitIntermediate5m
  2. Unit Testing with JestIntermediate5m
  3. API Test AutomationIntermediate5m
  4. Mocking and Test DoublesIntermediate5m
5

Professional Practice

7 topics
  1. Test Data ManagementIntermediate5m
  2. BDD with GherkinIntermediate5m
  3. Cross-Browser TestingAdvanced5m
  4. Test ReportingAdvanced5m
  5. CI IntegrationAdvanced5m
  6. Flaky TestsAdvanced5m
  7. Performance Testing with k6Advanced5m
6

Practice

2 topics
  1. Automation Framework ProjectAdvanced5m
  2. Interview QuestionsAdvanced15m

Code example

A taste of the track, from Introduction to Test Automation.

TypeScripttests/home.spec.ts Illustrative
import { test, expect } from '@playwright/test';


test('home page shows the tagline and search', async ({ page }) => {
  await page.goto('https://techiebabaji.com/');
  await expect(page).toHaveTitle(/Techie Babaji/);
  await expect(page.getByRole('searchbox').first()).toBeVisible();
});


// npm init playwright@latest   →   npx playwright test
Expected output
Running 1 test using 1 worker
  ✓  1 [chromium] › home.spec.ts:3:5 › home page shows the tagline and search (1.2s)
  1 passed (2.4s)

Practice exercises

Introduction to Test Automation

Name one test you should not automate.

What to Automate

A tax rule has 30 combinations to check every release. Automate at UI or API level?

Test Automation Pyramid

Where should “email address must contain @” be tested?

Choosing a Framework

Your team builds React apps in TypeScript. Which UI tool would you trial first?

Selenium WebDriver Setup

Run the same test in Firefox.

Locators

Write a CSS selector for <input name="search" type="search">.

Show all 23 exercises
Waits

Wait until a button with id "pay" is enabled.

Page Object Model

Add a SearchFor(term) action to a HeaderComponent that returns a ResultsPage.

Playwright Fundamentals

Run only tests whose title contains “search”.

Playwright Locators and Assertions

Assert that a “Delete” button inside the Mouse row is disabled.

Playwright Test Runner

Run only the mobile project.

Unit Testing with xUnit

Add a test row proving an unknown coupon gives no discount.

Unit Testing with Jest

Assert that an array contains "React".

API Test Automation

Add a test that GET /api/products/999999 returns 404.

Mocking and Test Doubles

Stub ChargeAsync to fail and assert PlaceOrderAsync returns false and sends no email.

Test Data Management

Why should test-support endpoints be disabled in production?

BDD with Gherkin

Write a Given/When/Then scenario for a locked account.

Cross-Browser Testing

Which Playwright engine represents Safari?

Test Reporting

Configure Playwright to keep screenshots only for failed tests.

CI Integration

Run tests nightly at 2:00 UTC in GitHub Actions.

Flaky Tests

A test fails only after midnight UTC. What is the likely cause?

Performance Testing with k6

Change the script into a spike test: 0 → 300 users in 10 seconds, hold 1 minute.

Automation Framework Project

Run only tests tagged @smoke.

Common interview questions

Frequently asked questions

Selenium or Playwright?
Both are widely used. Selenium has the longest history and supports many languages; Playwright is newer, faster to set up and has built-in auto-waiting. This track teaches both so you can work with either.
Which language should I use?
Use the language your development team uses. Examples here use JavaScript/TypeScript for Playwright and Jest, and C# for Selenium and xUnit.