class ParallelTests::Test::Runner

def execute_command(cmd, process_number, num_processes, options)
  number = test_env_number(process_number, options).to_s
  env = (options[:env] || {}).merge(
    "TEST_ENV_NUMBER" => number,
    "PARALLEL_TEST_GROUPS" => num_processes.to_s,
    "PARALLEL_PID_FILE" => ParallelTests.pid_file_path
  )
  cmd = ["nice", *cmd] if options[:nice]
  # being able to run with for example `-output foo-$TEST_ENV_NUMBER` worked originally and is convenient
  cmd.map! { |c| c.gsub("$TEST_ENV_NUMBER", number).gsub("${TEST_ENV_NUMBER}", number) }
  print_command(cmd, env) if report_process_command?(options) && !options[:serialize_stdout]
  execute_command_and_capture_output(env, cmd, options)
end