class MiniTest::Unit

def self.autorun
  at_exit {
    next if $! # don't run if there was an exception
    # the order here is important. The at_exit handler must be
    # installed before anyone else gets a chance to install their
    # own, that way we can be assured that our exit will be last
    # to run (at_exit stacks).
    exit_code = nil
    at_exit { exit false if exit_code && exit_code != 0 }
    exit_code = MiniTest::Unit.new.run ARGV
  } unless @@installed_at_exit
  @@installed_at_exit = true
end