Javascript 使用jasmine监视全局对象

这是我的js代码

launchTask(taskId)
{
    const taskIds = window.external.MyObjectFactory("INDEXED");
    taskIds.add(taskId);
}

下面是我如何创建一个间谍并为上面的函数编写我的规范

describe("The launchTask function", () => {
    beforeEach(() => {
        global.external.MyObjectFactory= jasmine.any(Function);
        spyOn(global.external, 'MyObjectFactory').and.callThrough();
        jasmine.createSpyObj("global.external.MyObjectFactory", ["add"]);
    });
    it("Scene 1", () => {
        launchTask(123);
        expect(global.external.MyObjectFactory).toHaveBeenCalledWith("INDEXED")
        expect(global.external.MyObjectFactory("INDEXED").add).toHaveBeenCalledWith(123)

    });

});

---

第一个expect传递时没有任何错误，而第二个expect给了我一个错误计划。apply不是一个函数

您实际上还没有将函数add附加到MyObjectFactory。试着这样做：

describe("The launchTask function", () => {
    let spyObj;
    beforeEach(() => {
        global.external.MyObjectFactory= jasmine.any(Function);
        spyObj = jasmine.createSpyObj(["add"]);
        spyOn(global.external, 'MyObjectFactory').and.returnValue(spyObj);
    });
    it("Scene 1", () => {
        launchTask(123);
        expect(global.external.MyObjectFactory).toHaveBeenCalledWith("INDEXED");
        expect(spyObj.add).toHaveBeenCalledWith(123);
    });
});