Shallow Integration Testing in Angular.

Shallow Integration Testing in Angular.

Shallow Integration Testing in Angular. In Angular, we have 4 different main types of testing. Isolated unit testing; Shallow unit testing; Integration testing. TestBed, fixture, and other scary words.

TestBed, fixture, and other scary words.

Previously, I briefly described how t create unit tests for the isolated methods. This is a good approach if you need to test just the logic (in the service, for example). But how can you be sure that the user will see the changes on the UI? You will need to check the HTML template as well.

For such an exercise, we need to use special tools from the Angular testing toolset.

TestBed and fixture

TestBed is the main tool for integration tests. TestBed creates a component and template, which allows us to test them together. To create a new module for testing, simply call a method configureTestingModule. It has very similar parameters as if we creating a real module. At a bare minimum, we need to create a component for testing. For doing this, just add the name of the component to the declarations section.

    beforeEach(() => {
        TestBed.configureTestingModule({
           declarations: [HeroDetailComponent],
           schemas: [NO_ERRORS_SCHEMA]
        })
        fixture = TestBed.createComponent(HeroDetailComponent);
        HERO = {id: 1, name: "test"};
    })

For working with the component under test, we need to use a special object, called a fixture. By calling the method createComponent (with the name of the component as a parameter), we create a test component.

fixture= TestBed.createComponent(HeroesComponent);

component = fixture.componentInstance;

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