如何通过在我的spec文件中创建angular2组件的新实例来调用方法?

时间:2016-06-01 08:15:53

标签: angular angular2-testing

我的myComponent包含method1method2ngOnInit

export class myComponent  {

//input and output declaration

public myVar;
constructor( @Inject(ElementRef) private elementRef: ElementRef) {

}
public method1() { return this.myVar.val().toUpperCase(); }
public method2() { return this.myVar .val(""); }
public ngOnInit() {

this.myVar = //calling jQuery autocomplete method which in turns calls $.JSON () to get data .
//
}

这是该组件的html模板:

<input type="text" value="{{symbol}}" size="{{size}}" maxlength="94"><span></span>

这是我的spec文件。我需要确保插入的任何值都转换为大写。

describe('myComponent Component', () => {
    beforeEachProviders(() => [myComponent, provide(ElementRef, { useValue: new MockElementRef() })]);
    class MockElementRef implements ElementRef {
        nativeElement = {};
    }

    it('should check uppercase conversion',inject([TestComponentBuilder, myComponent , ElementRef], (tcb:TestComponentBuilder) => {
            tcb.createAsync(myComponent)
                .then((fixture) => {
                    const element = fixture.nativeElement.firstChild;
                    element.setAttribute("value", "g");
                    element.setAttribute("size", 12); //setting size and value for input element
                    var getMyElem= $(element);

                    let ac= new myComponent(fixture.nativeElement); 

                    ac.ngOnInit(); //undefined
  //ac.method1(); unable to call
                    console.log(myComponent.prototype.method1()); //it calls value method but outputs cannot read val of undefined                     
                    expect(element.getAttribute("value")).toBe("G");

                });
        }));
});

我希望将值“g”设置为等于“g”,并在调用method1()后检查“G”是否返回。

问题:

1.在创建myComponent的实例时,是否将fixture.nativeElement作为参数传递?
2.另外,如果你可以帮我测试组件内部调用的$ .JSON方法。如何模拟JSON请求?

1 个答案:

答案 0 :(得分:2)

您不能通过new SomeComponent()创建组件实例。组件需要由Angular创建,如tcb.createAsync(SomeComponent)。如果myComponent位于AutocompleteComponent的模板中,则会从fixture进行查询。