TechLead
Testing
JestVitestPlaywrightRTL

Write tests that give you confidence. Learn unit testing, integration testing, E2E testing, and best practices for reliable applications.

Free Tutorial

Testing Tutorial - Unit, Integration & E2E Testing

Learn how to write effective tests for web applications. Master the testing pyramid, write unit tests with Jest and Vitest, integration tests with React Testing Library, and E2E tests with Playwright for complete coverage.

Prerequisites

Before learning testing, you should be comfortable with JavaScript and have basic knowledge of React for component testing examples.

JavaScript TutorialReact Tutorial

What You'll Learn

  • ✓ Testing fundamentals & pyramid
  • ✓ Unit testing with Jest & Vitest
  • ✓ Mocking, spies & test doubles
  • ✓ React Testing Library
  • ✓ Integration testing patterns
  • ✓ E2E testing with Playwright
  • ✓ CI/CD integration
  • ✓ Testing best practices

Course Topics

Lesson 1
Testing Fundamentals
Understanding why we test, types of testing, and building a testing mindset
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Lesson 2
The Testing Pyramid
Understanding the optimal balance of unit, integration, and E2E tests
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Lesson 3
Beginner
20 min
Unit Testing Deep Dive
Master unit testing with Jest: mocking, spies, test organization, and best practices
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Lesson 4
Intermediate
25 min
Integration Testing
Test how components work together: API integration, database testing, and component interactions
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Lesson 5
Intermediate
30 min
End-to-End Testing
Test complete user workflows with Playwright and Cypress: browser automation, user interactions, and real-world scenarios
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Lesson 6
Advanced
20 min
Testing Best Practices
Real-world testing strategies, common patterns, debugging techniques, and building maintainable test suites
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Why Testing Matters

🛡️

Confidence

Refactor and add features without fear of breaking existing functionality.

🐛

Catch Bugs Early

Find and fix issues before they reach production and affect users.

📚

Documentation

Tests serve as living documentation showing how your code should work.

Ready to Write Better Tests?

Begin your testing journey with unit testing fundamentals. You'll learn how to write your first tests with Jest and understand the testing mindset.

Start Learning Testing →