Back-end Engineering

4 courses

Test Driven Development in TypeScript & Jest

Master TDD principles for TypeScript by writing clean, testable code with Jest. Learn mocking, stubbing, and test doubles, and dive into refactoring techniques for maintainable code. Boost efficiency, reduce bugs, and build robust, scalable applications with this hands-on course.

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This learning path includes:

4 courses with bite-sized lessons and practices

21 engaging lessons in text and video formats

101 hands-on practices

One-on-one guidance from Cosmo, our AI tutor

Verified skills you'll gain

INTERMEDIATE

Programming, Algorithms, and Data Structures

INTERMEDIATE

Computer Science Fundamentals

Tools you'll use

Jest

TypeScript

Trusted by learners working at top companies

6 lessons

27 practices

Foundations of TDD in TypeScript and Jest: The Principles

This course introduces Test-Driven Development (TDD) for TypeScript projects, covering the Red-Green-Refactor workflow, TDD mindset, and setup with Jest. Learn best practices like SOLID principles and dependency injection, and explore TDD's impact on code quality and speed compared to traditional approaches.

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5 lessons

27 practices

Red-Green-Refactor: Practicing TDD with JavaScript & Jest

This course focuses on practicing the core TDD workflow: "Red-Green-Refactor." You'll write failing tests (Red), implement code to pass them (Green), and refactor while keeping tests passing (Refactor). No new concepts are introduced—just hands-on practice with various requirements to sharpen your TDD skills.

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5 lessons

25 practices

Isolating Dependencies with Test Doubles with TypeScript & Jest

Discover the pivotal role of test doubles in modern software testing. This introductory session will guide you through the essentials of dummies, stubs, spies, mocks, and fakes. Learn how these powerful tools help you isolate units under test, control behavior, and build reliable, fast, and maintainable tests. Step into the world of test doubles and elevate your software development skills.

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5 lessons

22 practices

Refactoring by Leveraging Your Tests with TypeScript & Jest

This course focuses on the Refactor step in TDD, teaching developers to spot code smells and resolve them through refactoring. Using real-world examples, you'll identify common issues, apply refactoring techniques, and ensure functionality is preserved with existing tests.

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Meet Cosmo: The smartest AI guide in the universe

Our built-in AI guide and tutor, Cosmo, prompts you with challenges that are built just for you and unblocks you when you get stuck.

Whether you’re leveling up or just starting out, find your next step here.