app.component.spec.ts

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

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

describe('AppComponent', () => {
  beforeEach(
    waitForAsync(() => {
      TestBed.configureTestingModule({
        declarations: [AppComponent],
      }).compileComponents();
    })
  );

  it('should create the app', () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.componentInstance;
    expect(app).toBeTruthy();
  });

  it("should have as title 'example'", () => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.componentInstance;
    expect(app.title).toEqual('example');
  });

  it('should render title', () => {
    const fixture = TestBed.createComponent(AppComponent);
    fixture.detectChanges();
    const compiled = fixture.nativeElement;
    expect(compiled.querySelector('.content span').textContent).toContain(
      'example app is running!'
    );
  });
});