public void Sys_column_type_usages_null()
 {
     column_type_usages ctu = new column_type_usages();
     List<column_type_usages> ctuList = ctu.ToList;
     Assert.AreEqual<List<column_type_usages>>(ctuList, null);
 }
 public void Sys_column_type_usages()
 {
     column_type_usages ctu = new column_type_usages(connStr);
     List<column_type_usages> ctuList = ctu.ToList;
 }