Jasmine Framework

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Need explanation on the below testing code.

import { TestBed, async } from '@angular/core/testing';

import { AppComponent } from './app.component';

describe('AppComponent', () => {

beforeEach(async(() => {

TestBed.configureTestingModule({

declarations: [

AppComponent

],

}).compileComponents();

}));

it('should create the app', async(() => {

const fixture = TestBed.createComponent(AppComponent);

const app = fixture.debugElement.componentInstance;

expect(app).toBeTruthy();

}));