for Unit Testing , setting up Add function of repository pattern that is wrapped using Unit Of Work pattern

My test looks like this

[Fact]
public void SimpleAddTest()
{
    // Arrange
    var authorizationsToBeAdded = new List<PatientPayerAuthInfo>
    {
        new PatientPayerAuthInfo (),
        new PatientPayerAuthInfo  ()
    }.ToList();
    var persistentAuthorizations = new List<PatientPayerAuthInfo>
    {
        new PatientPayerAuthInfo {PatientPayerAuthInfoId = 1 },
        new PatientPayerAuthInfo  {PatientPayerAuthInfoId = 2 },
         new PatientPayerAuthInfo  {PatientPayerAuthInfoId = 3 },
         new PatientPayerAuthInfo  {PatientPayerAuthInfoId = 4 }
    }.AsQueryable();

    var mockSet = new Mock<DbSet<PatientPayerAuthInfo>>();
    mockSet.As<IQueryable<PatientPayerAuthInfo>>().Setup(m => m.Provider).Returns(persistentAuthorizations.Provider);
    mockSet.As<IQueryable<PatientPayerAuthInfo>>().Setup(m => m.Expression).Returns(persistentAuthorizations.Expression);
    mockSet.As<IQueryable<PatientPayerAuthInfo>>().Setup(m => m.ElementType).Returns(persistentAuthorizations.ElementType);
    mockSet.As<IQueryable<PatientPayerAuthInfo>>().Setup(m => m.GetEnumerator()).Returns(persistentAuthorizations.GetEnumerator());

    var mockedUnitOfWork = new Mock<IUOW<DBContext>>();     

    var service = new PatientPayerService(mockedUnitOfWork.Object);

    // Act
    var sut = service.AddPatientPayerAuthInfos(authorizationsToBeAdded);

    // Assert

}

service layer function looks like this

     public void AddPatientPayerAuthInfos(IEnumerable<PatientPayerAuthInfo> patientPayerAuthInfos)
{
    foreach (var patientPayerAuthInfo in patientPayerAuthInfos)
    {
        UOW.PatientPayerAuthInfos.Add(patientPayerAuthInfo);
    }
    UOW.SaveChanges();
}

AND Repository implementation is

   public virtual void Add(T entity)
{
    DbEntityEntry dbEntityEntry = DbContext.Entry(entity);
    if (dbEntityEntry.State != EntityState.Detached)
    {
        dbEntityEntry.State = EntityState.Added;
    }
    else
    {
        DbSet.Add(entity);
    }
}

which then has a commit method that calls EF's SaveChanges.

my question is how we can Setup mockedUnitOfWork using persistentAuthorizations so that when i add Two objects using authorizationsToBeAdded then the total count of persistentAuthorizations becomes 6, which are 4 initially.

or correct me if i am on wrong track.