Unit Testing Angular Auth Interceptors

Testing authentication logic is critical to securing modern web applications, yet verifying interceptors often presents unique challenges for developers. This course provides a clear, text-based path to understanding how interceptors function and how to confidently verify their behavior. You will learn to isolate your authentication logic and write robust tests without making actual network requests. Starting with foundational concepts, you will explore how HTTP requests flow through your application and how to intercept them to inject authorization headers or handle token refresh cycles. You will then progress to setting up clean, modern test suites that mirror real-world production environments. What you'll learn: Understand the core architecture of HTTP interceptors and how they modify requests and responses; Configure the mock HTTP testing environment using modern testing modules and controllers; Write unit tests to verify that authorization tokens are correctly attached to outgoing headers; Handle edge cases such as token expiration, mock HTTP errors, and request redirection; Apply clean coding standards and modern testing patterns to keep your test suites maintainable. This course begins with essential definitions and architectural concepts before guiding you through structured, written testing scenarios. It is designed for front-end developers and engineers who have a basic understanding of web development and want to master testing asynchronous HTTP behavior. Step up your testing skills and ensure your application's security layers are fully covered.