Question

我刚刚开始使用Ionic 3开发我的第一个应用程序，现在正在进行一些单元测试。现在，当Service是其依赖项之一时，我面临着“编译” Platform的单元测试的问题。

这里是Service的摘要：

@Injectable()
export class MyService {
  constructor(public platform: Platform) {}

  myMethod(): Observable<any> {
    if (this.platform.is('android')) {
      return new Observable(android);
    else if (this.platform.is('ios')) {
      return new Observable(iOS);
    }
  }
}

这是我根据互联网上的一些教程进行的单元测试：

describe('XXX', () => {
  var service: MyService;

  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [MyService, Platform]
    });
  });

  it('should xxx', inject([MyService], (service) => {
    var result = service.mymethod();
    expect(result).toBeDefined();
  }));
});

我的测试配置已按照此blog post进行。我还有其他spec个文件可以成功运行，但该文件会引发以下错误：

PS C:\Workspaces\JS-TS\taccess> npm run test

> taccess@0.0.1 test C:\Workspaces\JS-TS\taccess
> karma start ./test-config/karma.conf.js --single-run

(node:17164) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
‼ ｢wdm｣:
i ｢wdm｣: Compiled with warnings.
i ｢wdm｣: Compiling...
‼ ｢wdm｣:
i ｢wdm｣: Compiled with warnings.
26 07 2018 07:20:43.963:INFO [karma]: Karma v2.0.5 server started at http://0.0.0.0:9876/
26 07 2018 07:20:44.003:INFO [launcher]: Launching browser Chrome with unlimited concurrency
26 07 2018 07:20:44.806:INFO [launcher]: Starting browser Chrome
26 07 2018 07:20:54.988:INFO [Chrome 68.0.3440 (Windows 10 0.0.0)]: Connected on socket u2KlYyff-qRa_fnHAAAA with id 6508927
Chrome 68.0.3440 (Windows 10 0.0.0) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught Error: Cannot find module './components/app/app-root'",
    "str": "An error was thrown in afterAll\nUncaught Error: Cannot find module './components/app/app-root'"
  }
Chrome 68.0.3440 (Windows 10 0.0.0) ERROR
  {
    "message": "An error was thrown in afterAll\nUncaught Error: Cannot find module './components/app/app-root'",
    "str": "An error was thrown in afterAll\nUncaught Error: Cannot find module './components/app/app-root'"
  }

Chrome 68.0.3440 (Windows 10 0.0.0): Executed 0 of 0 ERROR (0.008 secs / 0 secs)


Chrome 68.0.3440 (Windows 10 0.0.0): Executed 0 of 0 ERROR (0.142 secs / 0 secs)

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! taccess@0.0.1 test: `karma start ./test-config/karma.conf.js --single-run`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the taccess@0.0.1 test script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\xxx\AppData\Roaming\npm-cache\_logs\2018-07-26T05_20_56_762Z-debug.log

为什么我需要向服务中注入Platform？因为我正在使用BLE的Cordova插件，所以iOS和Android之间存在一些我需要管理的差异。

有人对正在发生的事情有任何线索吗？我在做什么错了？

注释1 ：我已经检查过使用Platform删除依赖项，并且该测试（由于缺少Platform而进行了一些修改）效果很好。

Answer 1

一段时间后，我发现了问题所在：Visual Studio代码。

由于某些原因，VSCode更改了此导入

import { Platform } from 'ionic-angular';

与其他人

import { Platform } from 'ionic-angular/umd';

我一移除/umd的一切，就像魅力一样。

希望这对以后的人有帮助。

在Ionic中的服务的单元测试中注入<platform>时引发的错误

1 个答案: