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监视变量值-角度2+

typescript angular javascript

0

physicsboy · 技术社区 · 7 年前

是否可以监视变量的值?

我想检查一个变量的值在我执行一个函数之后是否发生了变化,即:

阿普茨

export class AppComponent {
    var someVar = '';

    myfunct() {
      this.someVar = 'hello world';
    }
}

App.T.TS

let component: AppComponent

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

    fixture = TestBed.createComponent(AppComponent);
    component = fixture.componentInstance;

it('should equal hello world', () => {
  component.myFunct();
  expect(component.someVar).toEqual('hello world');

});

1 回复 | 直到 7 年前

1

yoerids 7 年前

export class ExampleComponent {
    public someVar: string;

    constructor() {
       this.someVar = "";
    }

    public someFunction() {
       this.someVar = "Hello World";
    }
}

 describe("ExampleComponent", () => {
   let component: ExampleComponent;
   describe("When the component is initialized", () => {
      beforeEach(() => {
        component = new ExampleComponent();
      });

      it("should have a variable someVar that is empty"), () => {
        expect(component.someVar).toEqual("");
      });

      describe("And when someFunction is called", () => {
        beforeEach(() => {
            component.someFunction();
        });

        it("should have a variable someVar that is 'Hello World'"), () => {
            expect(component.someVar).toEqual("Hello World");
        });
    });
  });
});