Quick question about writing unit tests for Scala

Quickly, wanted to be able to write some tests for Scala for my proposed
(trivial) PrettyPrinter change, but is there anything that describes the
testing approach? I see there is a 'partest' directory, and SUnit tests,
but then SUnit is described as deprecated and to-be-removed in 2.8. Is
there an alternative preferred test framework, or all tests still SUnit
tests? Is there a document anywhere that describes the overall testing
approach?

Thanks a lot in advance,

Cheers, Tony.