class ParallelTests::Test::Runner

def find_tests(tests, options = {})
  (tests || []).map do |file_or_folder|
    if File.directory?(file_or_folder)
      files = files_in_folder(file_or_folder, options)
      files.grep(/#{Regexp.escape test_suffix}$/).grep(options[:pattern]||//)
    else
      file_or_folder
    end
  end.flatten.uniq
end