.autotest.rb

# .autotest in your project or ~/.autotest
# This reduces the time from when you save a file to when autotest runs the tests.

# Optimization: Quicker response time for the files you change more than once
class Autotest
  alias_method :find_files_orig, :find_files
  
  def find_files
    result = {}
    @recently_updated ||= []
    @recently_updated.each do |file|
      result[file] = File.stat(file).mtime rescue nil
      return result if result[file] && self.last_mtime < result[file]
    end
    find_files_orig
  end

  alias_method :find_files_to_test_orig, :find_files_to_test
    
  def find_files_to_test(files = find_files)
    @recently_updated ||= []
    updated = files.select { |filename, mtime| self.last_mtime < mtime }
    updated.each do |file|
      @recently_updated << file.first unless @recently_updated.include?(file.first)
    end
    find_files_to_test_orig(files)
  end
end

Autotest.add_hook :initialize do |at|
  
  # Makes change detection much faster (but CPU usage higher)
  at.sleep = 0.1

end