角度测试,针对不同的测试用例动态更改ActivatedRoute参数

Question

零件:

@Component({
  selector: 'app-test',
  templateUrl: './test.component.html'
})
export class TestComponent implements OnInit {
  useCase: string;

  constructor(
    private route: ActivatedRoute,
  ) {}

  ngOnInit() {
    this.route.queryParams.subscribe(p => {
      if (p) {
        this.useCase = p.u;
      }
    });
  }
}

测试规格

describe('TestComponent', () => {
  let component: TestComponent;
  let fixture: ComponentFixture<TestComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [
        AppModule
      ],
      providers: [
        { provide: ActivatedRoute, useValue: ??? }
      ]
    })
      .compileComponents();
  }));

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

  it('should create', () => {
    expect(component).toBeTruthy();
    expect(component.useCase).toBeFalsy();
  });

  it('should set useCase variable with query string value', () => {
    fixture.detectChanges();
    // Set different route.queryParams here...
    expect(component.useCase).toBe('success');
  });
});

使用Angular 6,Karma和Jasmine进行单元测试.

我知道我们可以设置ActivatedRoute一个将在整个测试中使用的对象,如下所示:

providers: [
  { provide: ActivatedRoute, useValue: {
    queryParams: Observable.of({id: 123})
  } }
]

但这将设置所有测试用例的值.有没有办法动态更改ActivatedRoute每个不同的测试用例？

Answer 1

如果要将其存储在变量中,可以在其函数中使用TestBed.get(ActivatedRoute)来获取它.您也可以更新值.