Learn the core principles and importance of testing in frontend development.

• Why test frontend code?
• Types of testing
• Testing pyramid
• Test-driven development
• Behavior-driven development
• Testing philosophy
• Cost of bugs
• Testing mindset

Master unit testing for individual functions, components, and modules.

• Unit testing concepts
• Arrange, Act, Assert
• Test isolation
• Mocking dependencies
• Test coverage
• Edge cases
• Unit test best practices
• Red-Green-Refactor

Learn Jest, the popular JavaScript testing framework for comprehensive testing.

• Jest setup and configuration
• Writing test suites
• Matchers and assertions
• Mocking with Jest
• Snapshot testing
• Async testing
• Jest CLI and watch mode
• Custom matchers

Test React components effectively with React Testing Library.

• Testing Library philosophy
• Rendering components
• Querying elements
• User interactions
• Async testing
• Custom render functions
• Testing hooks
• Best practices

Test how different parts of your application work together.

• Integration testing concepts
• Component integration
• API integration
• Testing with real data
• Database integration
• Service integration
• Contract testing
• Integration strategies

Implement comprehensive end-to-end testing for complete user workflows.

• E2E testing concepts
• User journey testing
• Browser automation
• Cross-browser testing
• Visual regression testing
• Performance testing
• E2E best practices
• Test maintenance

Master Cypress for modern end-to-end testing with excellent developer experience.

• Cypress setup
• Writing Cypress tests
• Cypress commands
• Custom commands
• Fixtures and aliases
• Network stubbing
• Visual testing
• CI/CD integration

Explore Playwright for reliable end-to-end testing across browsers.

• Playwright overview
• Cross-browser testing
• Page object model
• Playwright Test runner
• Visual comparisons
• Network interception
• Mobile testing
• Debugging tests

Learn to mock dependencies and external services for isolated testing.

• Mocking concepts
• Jest mocks
• API mocking
• Module mocking
• Timer mocking
• MSW (Mock Service Worker)
• Stub vs mock vs spy
• Mocking strategies

Measure and improve test coverage and overall test quality.

• Code coverage metrics
• Coverage reports
• Coverage thresholds
• Mutation testing
• Test quality metrics
• Flaky test detection
• Test performance
• Coverage tools

Integrate testing into continuous integration and deployment pipelines.

• CI/CD testing strategy
• Automated test execution
• Parallel test execution
• Test reporting
• Failure notifications
• Test artifacts
• Environment management
• Pipeline optimization

Master advanced testing patterns and strategies for complex applications.

• Test patterns
• Page Object Model
• Test data builders
• Parameterized tests
• Property-based testing
• Contract testing
• Accessibility testing
• Performance testing