class ParallelTests::Test::RuntimeLogger

def message(test, time)
  return unless method = test.public_instance_methods(true).detect { |method| method =~ /^test_/ }
  delta = "%.2f" % time
  filename = test.instance_method(method).source_location.first.sub("#{Dir.pwd}/", "")
  "#{filename}:#{delta}"
end