Autotest.send(:alias_method, :real_find_files, :find_files)
Autotest.send(:define_method, :find_files) do |*args|
real_find_files.select do |k,v|
(ENV['AUTOTEST'] and ! ENV['AUTOTEST'].empty?) ?
Regexp.new(ENV['AUTOTEST']).match(k) : true
end
end