测试角2组件与构造函数的参数

Question

说我有一个角2组件有两个输入参数：

@Component{... (omitted for clarity)}
export class SomeComponent {

@Input() a: number
@Input() b: number

}

当我想测试这个组件我有这样的：

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

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

该createComponent调用不带任何参数或允许我调用构造函数。我怎样才能实例化/测试各种数值的组成部分？

Answer 1

正如 JB Nizet 所指出的，当组件具有 @input 参数时，您需要在 beforeEach() 中初始化它们：```

beforeEach(() => {
    fixture = TestBed.createComponent(SomeComponent);
    component = fixture.componentInstance;
    component.a = 1;
    component.b = 2;
    fixture.detectChanges();
});

````