angular-docs-cn/aio/content/examples/testing/src/app/app-initial.component.spec.ts

// #docplaster
// #docregion
import { TestBed, async } from '@angular/core/testing';
// #enddocregion
import { AppComponent } from './app-initial.component';
/*
// #docregion
import { AppComponent } from './app.component';

describe('AppComponent', () => {
// #enddocregion
*/
describe('AppComponent (initial CLI version)', () => {
  // #docregion
  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();
  }));
  it(`should have as title 'app'`, async(() => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app.title).toEqual('app');
  }));
  it('should render title in a h1 tag', async(() => {
    const fixture = TestBed.createComponent(AppComponent);
    fixture.detectChanges();
    const compiled = fixture.nativeElement;
    expect(compiled.querySelector('h1').textContent).toContain('Welcome to app!');
  }));
});
// #enddocregion

/// As it should be
import { DebugElement } from '@angular/core';
import { ComponentFixture } from '@angular/core/testing';

describe('AppComponent (initial CLI version - as it should be)', () => {

  let app: AppComponent;
  let de: DebugElement;
  let fixture: ComponentFixture<AppComponent>;

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

    fixture = TestBed.createComponent(AppComponent);
    app = fixture.componentInstance;
    de = fixture.debugElement;
  });

  it('should create the app', () => {
    expect(app).toBeDefined();
  });

  it(`should have as title 'app'`, () => {
    expect(app.title).toEqual('app');
  });

  it('should render title in an h1 tag', () => {
    fixture.detectChanges();
    expect(de.nativeElement.querySelector('h1').textContent)
      .toContain('Welcome to app!');
  });
});