import { TestBed } from '@angular/core/testing' ; import { ReferenceService } from './reference.service' ; import { HttpClientTestingModule } from '@angular/common/http/testing' ; describe ( 'ReferenceService' , ( ) => { beforeEach ( ( ) => TestBed . configureTestingModule ( { imports : [ HttpClientTestingModule ] } ) ) ; it ( 'should be created' , ( ) => { const service = TestBed . get ( ReferenceService ) ; expect ( service ) . toBeTruthy ( ) ; } ) ; } ) ;