Make Engine.registerTest to use passed in SourceInfo.
Make Engine.registerTest to use passed in SourceInfo.

dotty-staging/scalatest,dotty-staging/scalatest,scalatest/scalatest,cheeseng/scalatest,dotty-staging/scalatest,cheeseng/scalatest,scalatest/scalatest,scalatest/scalatest,cheeseng/scalatest