Question

这是我的角色工厂，用打字稿写成：

export class DataService { 

constructor () {
   this.setYear(2015);
 }
setYear = (year:number) => {
        this._selectedYear =year;
     }
}

这是我的测试文件。

 import {DataService } from ' ./sharedData.Service';
 export function main() {
    describe("DataService", () => {
        let service: DataService;
        beforeEach(function () {
            service = new DataService();
        });

        it("should initialize shared data service", () => {
            spyOn(service, "setYear");
            expect(service).toBeDefined();
            expect(service.setYear).toHaveBeenCalled(2015);
        });
    });
}

当我运行文件时，测试失败说

**Expected spy setSelectedCropYear to have been called.
Error: Expected spy setSelectedCropYear to have been called.**

我无法弄清楚出了什么问题。任何人都可以告诉我测试有什么问题。

Answer 1

问题是你设置间谍太晚了。当您将间谍安装到服务上时，它已经被构造并且已经调用了setYear。但是你显然无法在构造之前将间谍装上服务。解决这个问题的一种方法是监视DataService.prototype.setYear。您可以确保服务实例调用它，声明Dataservice.prototype.setYear.calls.mostRecent（）。object是service。

Answer 2

修正了此处的问题是更新后的测试。

import {DataService } from ' ./sharedData.Service';
 export function main() {
    describe("DataService", () => {
        let service: DataService;
        beforeEach(function () {
            service = new DataService();
        });

        it("should initialize shared data service", () => {
           var spy = spyOn(service, "setYear").and.callThrough();
            expect(service).toBeDefined();
            expect(spy);
            expect(service._selectedYear).toEqual(2015);
        });
    });
}

Jasmine期待间谍被召唤

2 个答案: