class MiniTest::Unit::TestCase

def assert_performance validation, &work
  range = self.class.bench_range
  io.print "#{__name__}"
  times = []
  range.each do |x|
    GC.start
    t0 = Time.now
    instance_exec(x, &work)
    t = Time.now - t0
    io.print "\t%9.6f" % t
    times << t
  end
  io.puts
  validation[range, times]
end