public When_Employer_Check_Details_Submitted_Invalid_Phone_No_Digits()
{
var employerService = Substitute.For <IEmployerService>();
var opportunityService = Substitute.For <IOpportunityService>();
var referralService = Substitute.For <IReferralService>();
var viewModel = new EmployerDetailsViewModel
{
Phone = "ABC"
};
var config = new MapperConfiguration(c => c.AddMaps(typeof(EmployerMapper).Assembly));
var mapper = new Mapper(config);
_employerController = new EmployerController(employerService, opportunityService, referralService, mapper);
_result = _employerController.SaveCheckOpportunityEmployerDetailsAsync(viewModel).GetAwaiter().GetResult();
}