Single test runner in Rails

rt.rb

#!/usr/bin/env ruby

# ($:).unshift 'test'
($:).unshift '.'

file = ARGV.shift
opts = ARGV.join(' ')

cmd = if opts
        %{bin/rake test #{file} TESTOPTS="#{opts}"}
      else
        %{bin/rake test #{file}}
      end

puts "(from #{__FILE__}: #{cmd})"

system cmd