Testing Streams Using the HTTPClient Module

The HTTPClient module

Observables that are returned from the HTTP client are frequently used in our Angular code. How can we test those streams? Let’s look at the pattern we can use to test those observables. We’ll consider the following method inside RecipeService:

The saveRecipe method issues an HTTP request. There’s a very useful API that can be used in this case: HttpClientTestingModule. This API allows us to test HTTP methods that use the HTTP client. It also allows us to easily mock HTTP requests by providing ...