Expert Angular

TestBed

TestBed is the most important testing utility provided by Angular. It creates an Angular testing module--an @NgModule class, which we can use for our testing purposes.

Since it creates an @NgModule, we can define providers, imports, and exports--similar to our regular @NgModule configuration.

We can configure TestBed in either async or sync mode.

• For configuring TestBed asynchronously, we will use configureTestingModule to define the metadata of the object
• For configuring TestBed synchronously, we will define object instances of the component as discussed in our preceding section

Now, let's take a look at the code snippet as follows:

beforeEach(() => { fixture = TestBed.createComponent(AppComponent); comp = fixture.componentInstance ...