class ParallelTests::RSpec::Runner

def self.run_tests(test_files, process_number, num_processes, options)
  exe = executable # expensive, so we cache
  version = (exe =~ /\brspec\b/ ? 2 : 1)
  cmd = [exe, options[:test_options], (rspec_2_color if version == 2), spec_opts, *test_files].compact.join(" ")
  options = options.merge(:env => rspec_1_color) if version == 1
  execute_command(cmd, process_number, num_processes, options)
end