message: Fix failing tests due to missing snack bar module
diff: @@ -26,6 +26,7 @@ import { DomSanitizer } from '@angular/platform-browser'
  import { EventEmitter } from '@angular/core'
  import { SocketIoService } from '../Services/socket-io.service'
  import { ChallengeStatusBadgeComponent } from '../challenge-status-badge/challenge-status-badge.component'
  +import { MatSnackBarModule } from '@angular/material/snack-bar'
  class MockSocket {
  on (str: string, callback: Function) {
  @@ -76,7 +77,8 @@ describe('ScoreBoardComponent', () => {
  MatExpansionModule,
  MatTooltipModule,
  MatButtonToggleModule,
  - MatIconModule
  + MatIconModule,
  + MatSnackBarModule
  ],
  declarations: [ ScoreBoardComponent, ChallengeStatusBadgeComponent ],
  providers: [
  