Angular 如何模拟离子3中的ModalController 嘲弄 生产代码： 错误

TypeError:undefined不是src/test.ts（第61262行）中的对象（评估'modal.present'）

ModalController实现 找到了一个解决方案：

模仿 等级库文件中

spyOn（modalControllerMock，“create”）.and.callThrough（）

export class ModalControllerMock {
    public create(param1,param2) {
        let rtn: Object = {};
        rtn['present'] = (() => true);
        return rtn;
    }; };

 someFunc() {
        let modal = this.modalController.create(myComp, {
            stuff:stuff
        });
        modal.present();
    }

import {ModalController} from "ionic-angular";
import { mockApp, mockConfig, mockDeepLinker } from 'ionic-angular/util/mock-providers';

export class ModalControllerMock {
    constructor() {
        return new ModalController(mockApp(), mockConfig(), mockDeepLinker());
    }
};