import { TestBed , getTestBed } from '@angular/core/testing' ; import { HttpClientTestingModule , HttpTestingController } from '@angular/common/http/testing' ; import { RouterTestingModule } from '@angular/router/testing' ; import { StringsService } from 'src/app/shared/strings/strings.service' ; describe ( 'StringsService' , ( ) => { let injector ; let service ; let httpMock ; beforeEach ( ( ) => { TestBed . configureTestingModule ( { imports : [ HttpClientTestingModule , RouterTestingModule . withRoutes ( [ ] ) ] , providers : [ StringsService ] } ) ; injector = getTestBed ( ) ; service = injector . get ( StringsService ) ; httpMock = injector . get ( HttpTestingController ) ; } ) ; afterEach ( ( ) => { httpMock . verify ( ) ; } ) ; it ( 'should be created' , ( ) => { expect ( service ) . toBeTruthy ( ) ; } ) ; it ( 'loads strings by language' , ( ) => { service . loadStrings ( 'es' ) ; testCall ( 'strings/es.json' , 'GET' ) ; } ) ; const testCall = ( url , method , isError = false ) => { const req = httpMock . expectOne ( url ) ; expect ( req . request . method ) . toEqual ( method ) ; if ( isError ) { req . flush ( { alerts : [ { } ] } , { status : 500 , statusText : '' } ) ; } else { req . flush ( { data : [ { } , { } ] } ) ; } } ; } ) ;