public List <Test> GetAllTests()
        {
            List <Test> tests = new List <Test>();

            try
            {
                tests = _test_object.GetAllTests();
                if (tests != null)
                {
                    return(tests);
                }
                else
                {
                    throw new OASCustomException("Null data encountered.");
                }
            }
            catch (SqlException sqlex)
            {
                log.Error(sqlex);
            }
            catch (OASCustomException customex)
            {
                log.Error(customex.Message);
            }
            catch (Exception ex)
            {
                log.Error(ex.Message);
            }
            return(tests);
        }