Rapid Testing with Vitest: Master Unit Testing & Mocking

Ready to level up your testing game? In this course, Anthony Fu, the creator of Vitest, takes you on a journey through the fastest testing framework out there. Whether you're completely new to testing or want to sharpen your skills, this course is your perfect starting point.

Vitest is designed to offer lightning-fast feedback, making it easier than ever to test your code and ship reliable software. Built to integrate seamlessly with Vite (the ultra-fast build tool), Vitest brings rapid testing capabilities that can significantly improve your development workflow. We’ll cover everything you need to know—from the basics of unit testing to advanced topics like mocking, spying, and testing with Vue.js 3.

Why Unit Testing Matters

Unit testing is key to building maintainable and reliable applications. By writing tests for your code, you can catch issues early, boost your confidence when deploying to production, and save time in the long run. With Vitest, testing becomes an incredibly fast, enjoyable process that fits naturally into your development workflow.

In this course, we’ll teach you how to:

• Master Unit Testing with Vitest: Understand the importance of unit tests and learn how to write and organize them for your projects.
• Get Started with Test-Driven Development (TDD): We’ll guide you through TDD as you write a deep merge function from scratch. You’ll get comfortable with writing tests first and building your code around them.
• Mocking and Spying Techniques: Learn how to mock modules, spy on side effects, and mock network requests and timers to ensure your tests cover all use cases.
• Snapshooting with Vitest: Understand how to use snapshots for testing large or complex objects. Learn to update and manage snapshots easily.
• Test Vue Components: If you're working with Vue 3, we’ll show you how to test Vue components, Vue composables, and set up a DOM environment to test your app in real scenarios.

Key Features of This Course:

• Rapid Feedback with Vitest: Discover how Vitest’s super-fast feedback loop transforms your testing experience. It’s designed to minimize waiting time, so you can focus on coding.
• Practical, Hands-On Learning: This course isn’t just theory. You’ll get your hands dirty with real-world examples and learn how to write tests that actually matter.
• Testing Vue 3 with Vitest: If you’re a Vue developer, you’ll appreciate the deep dive into testing Vue 3 components and Vue composables using Vitest, making it the perfect fit for anyone building with Vue.

Why Choose This Course?

• From the Creator of Vitest: Learn from Anthony Fu, the creator of Vitest, who uses it in production for big projects like Vite, UnoCSS, and Slidedev.
• Master TDD: Get hands-on with Test-Driven Development (TDD) by writing and testing a deep merge function, giving you a solid foundation for writing tests before code.
• Mocking and Spying with Vitest: Learn how to mock modules, timers, and network requests—essential tools for creating robust, isolated tests.
• Faster Testing Feedback: Experience how Vitest’s fast feedback loop makes testing fun and efficient, improving your development speed and confidence.

Course Prerequisites

Before starting this course, it’s helpful to have a basic understanding of JavaScript. If you’re new to JavaScript, you can get up to speed by watching our Modern JavaScript: ES6 and Beyond course. If you haven’t worked with TypeScript before, you can also check out TypeScript Fundamentals: Learn TypeScript from Scratch to get the basics.

This course is perfect if you're looking to:

• Learn Vitest: Understand Vitest’s core features and how it fits into modern JavaScript and TypeScript workflows.
• Speed Up Your Testing: Reduce test execution times and get feedback faster than ever before with Vitest’s fast testing environment.
• Test Like a Pro: Learn best practices for unit testing, mocking, and testing Vue components to ensure your code is clean, reliable, and ready for production.

Start learning Vitest now and build reliable, battle-tested, and scalable apps!