import { HttpClientModule } from '@angular/common/http'; import { inject, TestBed } from '@angular/core/testing'; import { RouterTestingModule } from '@angular/router/testing'; import { PeriodResolver } from './period-resolver.service'; describe('PeriodResolver', () => { beforeEach(() => { TestBed.configureTestingModule({ imports: [HttpClientModule, RouterTestingModule], providers: [PeriodResolver], }); }); it('should be created', inject([PeriodResolver], (service: PeriodResolver) => { expect(service).toBeTruthy(); })); });