Vitest - JS/TS Testing Framework

Content

During the course, we develop step by step a comprehensive set of unit and integration tests for a modern JavaScript/TypeScript application. We focus on the practical application of Vitest:

– Overview and Architecture of Vitest:

• Comparison Vitest vs. Jest vs. Mocha
• Vite integration and performance benefits
• Installation and project setup
• Configuration and workspace setup – Fundamentals of Unit Testing:
• Test structure and best practices
• Describe, test, and it blocks
• Assertions and matchers
• Setup and teardown (beforeEach, afterEach) – Mocking and Stubbing:
• Function mocks and spies
• Module mocking
• Timer mocks (vi.useFakeTimers)
• Date and random mocking
• Partial mocks – Asynchronous Testing:
• Promises and async/await
• Callbacks and done
• Timeout handling
• Concurrent tests – Integration Testing:
• Testing component interactions
• API integration tests
• Database mocking
• Environment-specific tests – Frontend Testing with Vitest:
• DOM testing with happy-dom/jsdom
• Component testing (React, Vue, Svelte)
• Testing Library integration
• Event handling and user interactions – Code Coverage:
• Coverage reports with c8/istanbul
• Coverage thresholds
• Branch and line coverage
• Identifying uncovered code – Snapshot Testing:
• Inline snapshots
• File snapshots
• Snapshot updates and management
• Custom serializers – Performance and Optimization:
• Parallel test execution
• Test sharding
• Watch mode and HMR
• Benchmark tests with Vitest Bench – Advanced Features:
• Custom matchers
• Test context and fixtures
• In-source testing
• Type testing with expect-type – CI/CD Integration:
• GitHub Actions, GitLab CI integration
• Test reports and artifacts
• Parallel CI runs
• Docker-based test environments

The course is based on refined and tested course material with explanation, practical exercises, course project with code, solution code, and further information.

You will not only learn these concepts but also implement them practically.

The actual course content may differ from the above depending on the trainer, delivery, duration and the composition of participants.