Reactive Patterns with RxJS for Angular

Chapter 13: Testing RxJS Observables

Many developers consider testing observables a challenging task. This is true. But if you learn the right techniques, you can implement maintainable and readable tests in a very effective manner.

In this chapter, we will walk you through three commonly used patterns for testing streams. We will start by explaining the subscribe and assert pattern, after which we will discuss the marble testing pattern. Finally, we will highlight a suitable pattern for testing streams that are returned from HTTPClient by focusing on a concrete example in our Recipe app.

In this chapter, we're going to cover the following main topics:

• Learning about the subscribe and assert pattern
• Learning about the marble testing pattern ...