在ionic2中设置TDD

Question

我遵循了Joshua Moroney关于Ionic2和TDD的教程，但是在尝试调试错误时遇到了困难。

核心示例是这样的：

import { TestBed, ComponentFixture, async } from '@angular/core/testing';
import { By } from '@angular/platform-browser';
import { DebugElement } from '@angular/core';
import { IonicModule, NavController } from 'ionic-angular';
import { MyApp } from '../../app/app.component';
import { TabsPage } from './tabs';
let comp: TabsPage;
let fixture: ComponentFixture<TabsPage>;
let de: DebugElement;
let el: HTMLElement;
describe('Page: Tabs Page', () => {
beforeEach(async(() => {
    TestBed.configureTestingModule({
        declarations: [MyApp, TabsPage],
        providers: [
            NavController
        ],
        imports: [
            IonicModule.forRoot(MyApp)
        ]
    }).compileComponents();
}));
beforeEach(() => {
    fixture = TestBed.createComponent(TabsPage);
    comp    = fixture.componentInstance;
});
afterEach(() => {
    fixture.destroy();
    comp = null;
    de = null;
    el = null;
});
it('is created', () => {
    expect(fixture).toBeTruthy();
    expect(comp).toBeTruthy();
});
});

业力的输出是：

FAILED TESTS:
Page: Tabs Page
✖ is created
  PhantomJS 2.1.1 (Mac OS X 0.0.0)
  Chrome 57.0.2987 (Mac OS X 10.12.3)
TypeError: this.parent.unregisterChildNav is not a function
    at Tabs.ngOnDestroy (webpack:///~/ionic-angular/components/tabs/tabs.js:220:0 <- src/test.ts:56626:21)
    at callProviderLifecycles (webpack:///~/@angular/core/@angular/core.es5.js:11109:0 <- src/test.ts:11389:18)
    at callElementProvidersLifecycles (webpack:///~/@angular/core/@angular/core.es5.js:11078:0 <- src/test.ts:11358:13)
    at callLifecycleHooksChildrenFirst (webpack:///~/@angular/core/@angular/core.es5.js:11062:0 <- src/test.ts:11342:17)
    at destroyView (webpack:///~/@angular/core/@angular/core.es5.js:12280:0 <- src/test.ts:12560:5)
    at callViewAction (webpack:///~/@angular/core/@angular/core.es5.js:12391:0 <- src/test.ts:12671:13)
    at execComponentViewsAction (webpack:///~/@angular/core/@angular/core.es5.js:12333:0 <- src/test.ts:12613:13)
    at destroyView (webpack:///~/@angular/core/@angular/core.es5.js:12279:0 <- src/test.ts:12559:5)
    at callWithDebugContext (webpack:///~/@angular/core/@angular/core.es5.js:13060:25 <- src/test.ts:13340:42)
    at Object.debugDestroyView [as destroyView] (webpack:///~/@angular/core/@angular/core.es5.js:12614:0 <- src/test.ts:12894:12)
    at ViewRef_.destroy (webpack:///~/@angular/core/@angular/core.es5.js:10199:0 <- src/test.ts:10479:18)
    at ComponentRef_.destroy (webpack:///~/@angular/core/@angular/core.es5.js:9944:51 <- src/test.ts:10224:67)
    at ComponentFixture.destroy (webpack:///~/@angular/core/@angular/core/testing.es5.js:248:0 <- src/test.ts:40179:31)
    at Object.<anonymous> (webpack:///src/pages/tabs/tabs.spec.ts:40:16 <- src/test.ts:110812:17)
    at ZoneDelegate.invoke (webpack:///~/zone.js/dist/zone.js:365:0 <- src/test.ts:123570:26)`

这是测试单个组件，没有复杂性：

import { Component } from '@angular/core';
@Component({
  templateUrl: 'tabs.html'
})
export class TabsPage {
  constructor() {
  }
}

有人可以指出我有关如何解决这些问题的教程吗;而不仅仅是为这个单一问题提供解决方案？

谢谢

安 迪

Answer 1

我遇到了同样的问题。根据 ionic 文档，"每个单独的离子标签都是 NavController 的声明性组件"。因此，您需要使用 NavController 的提供程序，然后将模拟类用作类。在这里，您需要定义一个要注册的函数和一个用于注销 ChildNav 组件的函数。另请参阅：https://github.com/ionic-team/ionic/blob/master/src/navigation/nav-controller.ts我将Josh Morony提供的基类用作类，并将其扩展为包括：

public registerChildNav(nav: any) {
  // do nothing
}
public unregisterChildNav(nav: any) {
  // do nothing
}

选项卡规范页面具有以下相关条目(我将我的模拟放在与 src 目录相同的测试模拟目录中(：

import { NavController } from 'ionic-angular';
import { NavMock } from '../../../test-mocks/mocks';

providers: [
  //NavController,
  {
    provide: NavController,
    useClass: NavMock
  },
]

这应该可以做到。