protected void ApplicantDetailsShouldBeValid(BestStartGrant form, Action <ApplicantDetails> mutator, Action <ApplicantDetails> postVerify = null)
        {
            var applicantDetails = ApplicantDetailsBuilder.NewValid(mutator);

            ShouldBeValid(() => form.AddApplicantDetails(applicantDetails));
            postVerify?.Invoke(applicantDetails);
        }
 protected void ApplicantDetailsShouldBeInvalid(BestStartGrant form, Action <ApplicantDetails> mutator)
 {
     ShouldBeInvalid(() => form.AddApplicantDetails(ApplicantDetailsBuilder.NewValid(mutator)));
 }