间谍如何与茉莉花在角度7?

我认为你不能直接监视这个班的功能 Adders 像这样,而是监视 prototype 或者创建一个类的实例并监视它。我将使用两个间谍并像这样执行它:

it("spyon", () => {
  const countlistSpy = spyOn(Adders.prototype, 'countlist');
  const addSpy = spyOn(Adders.prototype, 'add');

  // call your function / trigger something that calls the function

  expect(countlistSpy).toHaveBeenCalledTimes(1);
  // more expectations here
});

或使用类的实例 beforeEach 块您可以这样定义实例:

let adder: Adders = new Adders();

然后你的测试会是这样的:

it("spyon", () => {
  const countlistSpy = spyOn(adder, 'countlist');
  const addSpy = spyOn(adder, 'add');

  // call your function / trigger something that calls the function

  expect(countlistSpy).toHaveBeenCalledTimes(1);
  // more expectations here
});

在Fabian答案的帮助下,我能够调试和解决我的问题。实际上,我需要在我监视的类中触发函数。这样做之后,它给了我预期的输出。

测试用例

it("spyOn countList add()", () => {
          const searchChangeEmitSpy =  spyOn(Adders,"add");
          Adders.addNewQuote("This is my second post");
          Adders.countlist(0);
          expect(searchChangeEmitSpy.calls.count()).toEqual(2);
        });

要监视的类内的函数

 countlist(i:number){
          this.quoteList.forEach(element => {
               console.log(element); 
               this.add(4,i++);    
          });
         //return i; 
      }