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 do |file, files_and_lines|
      "#{file}:#{files_and_lines.map(&:last).join(':')}"
    end
  end
  options[:env] ||= {}
  options[:env] = options[:env].merge({ 'AUTOTEST' => '1' }) if $stdout.tty?
  execute_command(build_command(combined_scenarios, options), process_number, num_processes, options)
end