What command line options are available if you're using the Test::Unit compatibility layer in ruby 1.9.1?
Background:
ruby test/test_all.rb --help
provides information on what command line options are available in ruby 1.8.7, but not in ruby 1.9.1 without the test-unit gem. Looking under Test and Test::Unit for ruby 1.9.1 rdoc doesn't help either.