public void DeleteEmployeeTest()
        {
            _unitOfWork.Setup(m => m.EmployeeRepository.DeleteEmployee(It.IsAny <Guid>()));
            EmployeeMgr employeeMgr = new EmployeeMgr(_unitOfWork.Object);

            employeeMgr.DeleteEmployee(Guid.Parse("{0F681332-D795-409A-85BB-B77678FB74EE}"));
            _unitOfWork.Verify(m => m.Commit());
        }