返回值Jasmine的延迟对象

我试图在jasmine中模拟延迟对象的返回,用于我正在测试的Angular2组件。

组件功能:

 public createAndExecuteIdentify(url) {
      identifyTask = this._widgetFactory.createIdentifyTask(url); //returns object
      return identifyTask.execute(this.identifyParams);  //this returns a deferred  
 }

规格:

 let fakeTask: any;

 fakeTask = {
        execute: jasmine.createSpy('execute'),
        url: "bob@bob.com"
 };
 fakeFactory.createIdentifyTask.and.returnValue(fakeIdentifyTask);

 describe("when executing identifyTask", () => {
    it("should return the proper object", () => {
        let taskReturn = component.createAndExecuteIdentify(fakeTask.url);
        expect(taskReturn).toEqual(jasmine.objectContaining({
            promise: {}
        }));
    });
});

这很有效,除了fakeTask。execute不返回延迟。

fakeTask的预期结果。execute()将返回如下对象:

 b.Deferred {promise: {…}, isResolved: ƒ, isRejected: ƒ, isFulfilled: ƒ, 
 isCanceled: ƒ, …}
 addCallbacks: ƒ (a,b)
 callback: ƒ (a)
 cancel: ƒ ()
 errback: ƒ (a)
 isCanceled: ƒ ()
 isFulfilled: ƒ ()
 isRejected: ƒ ()
 isResolved: ƒ ()
 progress: ƒ (a)
 promise: {isResolved: ƒ, isRejected: ƒ, isFulfilled: ƒ, isCanceled: ƒ, then: ƒ, …}
 reject: ƒ (a)
 resolve:ƒ (a) then: ƒ (b,d,h)
 _pendingDfd: b.Deferred {promise: {…}, isResolved: ƒ, isRejected: ƒ, isFulfilled: ƒ, isCanceled: ƒ, …}
 __proto__: Object

所以我想知道,如果以某种方式设置法克塔斯克的执行间谍返回延期会不会奏效?(如上图所示,real thing返回一个延迟的Dojo类型。 http://dojotoolkit.org/reference-guide/1.10/dojo/Deferred.html )