rspec

#!/usr/bin/env ruby
require "bundler/setup"
require "rspec/core"
RSpec::Core::Runner.disable_autorun!
RSpec::Core::Runner.trap_interrupt
options = RSpec::Core::ConfigurationOptions.new(ARGV)
runner = RSpec::Core::Runner.new(options)
runner.setup STDOUT, STDERR

examples = [[], [], []]
RSpec.world.ordered_example_groups.each_slice(3) do |(a, b, c)|
  examples[0] << a if a
  examples[1] << b if b
  examples[2] << c if c
  break
end

# before fork

pids = examples.map do |example_group|
  pid = Process.fork do
    exit 0 if example_group.empty?

    # assign env vars
    # after fork

    status = runner.run_specs(example_group)
    p status
    if status.to_i == 0
      exit 0
    else
      exit status
    end
  end
  exit 0 unless pid
  pid
end

pids.each do |pid|
  Process.waitpid(pid)
end