public void Delete_ExistingId_Deleted()
        {
            var id = 1;

            _unitOfWorkMock.Setup(uof => uof.EnrolleeGenericRepository.Delete(id));

            _sut.Delete(id);

            _unitOfWorkMock.Verify(uof => uof.EnrolleeGenericRepository.Delete(It.IsAny <int>()), Times.AtLeastOnce);
        }