Including dependencies in karma.config.js

After adding any dependencies to your seed project, you can have problems with test runners. Errors example:

The project builds in both dev and prod, however when I run test I get:
23 11 2016 08:57:45.846:WARN [web-server]: 404: /base/node_modules/ng2-dragula/ng2-dragula.js
Chrome 54.0.2840 (Windows 10 0.0.0) ERROR: '(SystemJS) XHR error (404 Not Found) loading http://localhost:9876/base/node_modules/ng2-d
ragula/ng2-dragula.js
Error: XHR error (404 Not Found) loading http://localhost:9876/base/node_modules/ng2-dragula/ng2-dragula.js
at XMLHttpRequest.wrapFn [as _onreadystatechange] (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?c35727d0e6
4913b5669320b167e496fc94fc6928:647:29)
at ZoneDelegate.invokeTask (http://localhost:9876/base/node_modules/zone.js/dist/zone.js?

It's a normal case because we need to configure our karma.config.js file and add there our new dependency. I will provide example based on ng2-dragula with dragula npm package:

$ git clone --depth 1 https://github.com/mgechev/angular2-seed.git

$ cd angular2-seed

$ npm install

$ npm i dragula ng2-dragula --save

src/client/app/shared/shared.module.ts

...
import { DragulaModule } from 'ng2-dragula/ng2-dragula';
...

@NgModule({
  ...
exports: [ToolbarComponent, NavbarComponent,
    CommonModule, FormsModule, RouterModule, DragulaModule]
....

karma.config.js

...
module.exports = function (config) {
  config.set({
      ....
      // Dragula
      { pattern: 'node_modules/dragula/**/*.js', included: false, watched: true },
      { pattern: 'node_modules/ng2-dragula/**/*.js', included: false, watched: true },
...

$ npm test