Rakefile

require 'cucumber'
require 'cucumber/rake/task'

Cucumber::Rake::Task.new :features

task :default => [:features]

task :first_half do
  puts 'test'
  Cucumber::Rake::Task.new do |t|
    t.cucumber_opts = Dir.glob('features/**/*.feature').select.each_with_index { |file, i| i.even? }.join(" ")
  end
end

task :second_half do
  Cucumber::Rake::Task.new do |t|
    t.cucumber_opts = Dir.glob('features/**/*.feature').select.each_with_index { |file, i| i.odd? }.join(" ")
  end
end