Run single test with Spring in Rails 4.1

test.rb

require 'optparse'
$: << Rails.root.join('test')

options = {}
OptionParser.new do |opts|
  opts.on('-n TEST_NAME') do |n|
    options[:test_name] = n
  end

  opts.on('-e ENVIRONMENT') do |e|
    raise ArgumentError.new("Must run in test environment") if e != 'test'
  end
end.parse!

test_files = ARGV.dup
ARGV.clear
if options[:test_name]
  ARGV << "-n" << options[:test_name]
end

test_files.each do |f|
  Dir[f].each do |f1|
    load f1
  end
end

Usage is almost like the good old ruby -I test way:

$ bin/rails r -e test script/test.rb test/controllers/my_controler_test.rb -n test_my_case
$ bin/rails r -e test script/test.rb test/controllers/**/*.rb