从Angular TestBed中访问DOM主体元素

import { TestBed, ComponentFixture } from '@angular/core/testing';
import { By } from '@angular/platform-browser';

let component: YourComponent;
let fixture: ComponentFixture<YourComponent>;

beforeEach(async(() => {
  TestBed.configureTestingModule({
    declarations: [YourComponent]
  })
  .compileComponents();
}));

beforeEach(() => {
  fixture = TestBed.createComponent(YourComponent);
  component = fixture.componentInstance;
  fixture.detectChanges();
});

const domElement = fixture.debugElement.query(By.css('.your-css-selector')).nativeElement;