how to test this business logic

Hi I would really be happy if someone can help me with unit testing this business logic on Visual Studio unit test..

I've google"ed" and checked different ways of unit testing but i keep finding the unit test for controllers which i dont need.. i'd be most happy if this method can be unit tested for me. Thanks

This is my Business class

   public void AddConsultation(ConsultationView cv, int patientid)
    {

        using (var deprepo = new ConsultationRepository())
        {
            if (cv.ConsultId == 0)
            {
                var curr = DateTime.Now;
                string date = curr.ToString("d");
                string  time= curr.ToString("t");
                var patient = da.Patients.ToList().Find(x => x.PatientId == patientid);

                Consultation _consultation = new Consultation
                {
                  ConsultId = cv.ConsultId,
                  ConsultDate = date,
                  ConsultTime = time,
                  illness = cv.illness,
                  PresribedMed = cv.PresribedMed,
                  Symptoms = cv.Symptoms,
                  U_Id = patient.PatientId,
                };

                deprepo.Insert(_consultation);
            }
        }
    }
    #endregion

This is my Repository Class

 public class ConsultationRepository:IConsultationRepository
{
    private DataContext _datacontext = null;
    private readonly IRepository<Consultation> _clinicRepository;

    public ConsultationRepository()
    {
        _datacontext = new DataContext();
        _clinicRepository = new RepositoryService<Consultation>(_datacontext);

    }

    public Consultation GetById(int id)
    {
        return _clinicRepository.GetById(id);
    }

    public List<Consultation> GetAll()
    {
        return _clinicRepository.GetAll().ToList();
    }

    public void Insert(Consultation model)
    {
        _clinicRepository.Insert(model);
    }

    public void Update(Consultation model)
    {
        _clinicRepository.Update(model);
    }

    public void Delete(Consultation model)
    {
        _clinicRepository.Delete(model);
    }

    public IEnumerable<Consultation> Find(Func<Consultation, bool> predicate)
    {
        return _clinicRepository.Find(predicate).ToList();
    }

    public void Dispose()
    {
        _datacontext.Dispose();
        _datacontext = null;
    }
}