Testing Services
Learn how to test services by injecting AsyncService in the TestBed method.
We'll cover the following...
As we learned, a service can inject other services. Testing a standalone service is pretty straightforward: we get an instance from the injector and then start to query its public properties and methods.
Note: We are only interested in testing the public API of a service, which is the interface that components and other artifacts use. Private symbols do not have any value in being tested because they represent the internal implementation of the service.
There are three different types of testing that we can perform in a service:
Testing a synchronous operation, such as a method that returns a simple array.
Testing an asynchronous operation, such as a method that returns an observable.
Testing ...