public When_EmployerService_Is_Called_For_Invalid_CompanyNameAndId() { _employerRepository = Substitute.For <IRepository <Domain.Models.Employer> >(); var opportunityRepository = Substitute.For <IOpportunityRepository>(); _employerRepository.GetSingleOrDefaultAsync(Arg.Any <Expression <Func <Domain.Models.Employer, bool> > >(), Arg.Any <Expression <Func <Domain.Models.Employer, Guid> > >()) .Returns(Guid.Empty); var employerService = new EmployerService(_employerRepository, opportunityRepository, Substitute.For <IMapper>(), Substitute.For <IValidator <CrmEmployerEventBase> >(), Substitute.For <IMessageQueueService>()); _employerResult = employerService.ValidateCompanyNameAndCrmIdAsync(_employerCrmId, CompanyName).GetAwaiter().GetResult(); }