How to unit test business service methods using nunit and moq

As i am new to moq and Nunit, i dont know how to unit test the business service. I have the business service called studentdetailsbs.cs,i need to test whether fetchallstudents returns studentlist or not. More over internally the studentdetailbs class goes to unitofwork class and this again goes to respository class and gets data from entity framework.

public class StudentDetailbs<TEntity> :IStudentbs<TEntity> where TEntity:class
    {
        IUnitofwork _uow;
        //here unitofwork is inejcted
        public StudentDetailbs(IUnitofwork iunitofwork)
        {
            this._uow = iunitofwork;
        }
        public void Add(TEntity tentity)
        {
            //now call the studentdetail 
            StudentDetail objstudentdetail = (StudentDetail)(object)(tentity);
            this._uow.StudentRepo.Add(objstudentdetail);
            this._uow.Save();
        }

        public IEnumerable<StudentDetail> FetchallStudents()
        { 
            return this._uow.StudentRepo.GetAll();
        }

    }

my final questions are:

1.whether fetchallstudents method returns student list or not.

2.Whether add method properly inserts student record into database.

How to do this using Nunit and moq? Any suggestions.