class ParallelTests::Gherkin::Runner

def run_tests(test_files, process_number, num_processes, options)
  combined_scenarios = test_files
  if options[:group_by] == :scenarios
    grouped = test_files.map { |t| t.split(':') }.group_by(&:first)
    combined_scenarios = grouped.map {|file,files_and_lines| "#{file}:#{files_and_lines.map(&:last).join(':')}" }
  end
  sanitized_test_files = combined_scenarios.map { |val| WINDOWS ? "\"#{val}\"" : Shellwords.escape(val) }
  options[:env] ||= {}
  options[:env] = options[:env].merge({'AUTOTEST' => '1'}) if $stdout.tty? # display color when we are in a terminal
  cmd = [
    executable,
    (runtime_logging if File.directory?(File.dirname(runtime_log))),
    cucumber_opts(options[:test_options]),
    *sanitized_test_files
  ].compact.reject(&:empty?).join(' ')
  execute_command(cmd, process_number, num_processes, options)
end