Angular unit tests
The definition of a unit test in Angular is slightly different from the strict definition of unit testing we defined in the previous section. Angular CLI auto-generates unit tests for us using the Jasmine framework. However, these so-called unit tests include DOM-interactions because they render the view of the component.
Consider the architecture of an Angular component from Chapter 1, Introduction to Angular and Its Concepts:
Figure 4.2: Anatomy of a Component
Since Angular uses binding, the component class and its template are inseparable, effectively representing a unit. We can still write pure unit tests by testing individual functions, but otherwise, a component and its template are considered the smallest possible units to test.
As your application grows, you may find that Angular unit tests are slow to run, because they render views and resolve the dependency tree. There are various ways to deal with this problem, including...
