CultureInfo culture = CultureInfo.GetCultureInfo("zh-cn");

      List<TeamDto> teamDtos = teams
          .GroupBy(x => new
          {
            x.TestId,
            x.TestName
          })
          .Select(g => new TeamDto()
          {
            TestID = g.Key.TestId,
            Test = g.Key.TestName,
            Teams = g.ToList()
          })
          .OrderBy(t=>t.Test,StringComparer.Create(culture,true))
          .ToList();