SBT TestGrouping Doesn't Run in Parallel

Hi there,

I am using sbt 1.0.2 on teamCity and have a build.sbt with 

testGrouping in Test := { 
//Some codes that group tests into multiple test groups 
}

I tried this locally and all test groups are run in parallel. But after submitted to teamCity, it still ran sequentially(although the order changes sometimes) on teamCity.

I was wondering if there are any configurations for this that I forgot to set? And what is the best way to debug this?

Thanks