错误：预期是间谍，但得到了功能

Question

这是我的控制器：

    export class testController  {
    static $inject: string[] = ["testService", "$mdDialog", "$state"];
    constructor(public _testService: services.testService, private _mdDialog: any, private _$state: any) {
        this.isCurrentlyEditing = false;
        this.activate();
    }
    }

这是我的单元测试：

  import {test as service}  from './test.service';
  import {test as ctrl} from './test.controller';

  export function main() {
    describe("testController", () => {

    var mdDialog: angular.material.IDialogService;
    var state: ng.ui.IStateService;
    var testService: any;
    var controller: any;

    beforeEach(function () {
        angular.mock.module('comp.modules.addField');           
    });
    beforeEach(function () {
        testService = {
            showCLULayer: () => { }
        };
    });

    beforeEach(module('comp'));
    beforeEach(inject(($injector: any) => {

        mdDialog = $injector.get('$mdDialog');
        state = $injector.get('$state');
        testService = $injector.get('testService');
        controller = new ctrl.testController(testService, mdDialog, state);
    }));

    it("should Create Controller", () => {          
        controller = new ctrl.testController(testService, mdDialog, state);
        spyOn(testService, 'showCLULayer').and.callThrough();
        expect(controller).not.toBeNull();
        expect(controller.activate).toHaveBeenCalled();  
        ////error Expected a spy, but got Function.      
    });       

});
}

测试到行时抛出错误：

 expect(controller.activate).toHaveBeenCalled();

说期望一个间谍，但得到了功能。 Activate 是一个在我调用我正在测试的控制器的构造函数时被调用的函数。请有人指出我正确的方向。

尝试添加行

    spyOn(controller, 'activate'); 

出乎意料，我收到以下错误。

   Expected spy activate to have been called.
   Error: Expected spy activate to have been called.

Answer 1

在测试函数是否被调用之前，您需要监视该函数。试试这个：

it("should Create Controller", () => {          
        controller = new ctrl.testController(testService, mdDialog, state);
        spyOn(testService, 'showCLULayer').and.callThrough();
        expect(controller).not.toBeNull();

        spyOn(controller, 'activate');  // < ------------Spy on the function
        expect(controller.activate).toHaveBeenCalled();  
        ////error Expected a spy, but got Function.      
    });