Mocking and Stubbing Dependencies in Angular Tests

To write effective and reliable tests for Angular applications, it’s essential to understand how to handle dependencies. Dependencies can often introduce complexity and make testing difficult. However, by taking advantage of techniques such as mocking and stubbing, we can better control our tests and ensure the accuracy and stability of our application.

In this chapter, we’ll explore the concept of spies and method substitutes. Spies allow us to monitor and verify the behavior of dependencies during testing. We’ll learn how to create spies using the Jasmine test framework and use them to find out whether certain methods have been called, how many times they’ve been called, and with what parameters. In addition, we’ll discover the power of method substitutes, which allow us to replace the implementation of a method with our own custom logic.

Next, we’ll take a look at TestBed providers...