message: Add missing import for SocketIoService
diff: @@ -7,6 +7,7 @@ import { async, ComponentFixture, TestBed, fakeAsync } from '@angular/core/testi
  import { ServerStartedNotificationComponent } from './server-started-notification.component'
  import { ChallengeService } from '../Services/challenge.service'
  +import { SocketIoService } from '../Services/socket-io.service'
  import { of, throwError } from 'rxjs'
  import { EventEmitter } from '@angular/core'
  