$cake = "/Applications/MAMP/bin/php5/bin/php /Applications/MAMP/htdocs/yourProject/cake/console/cake.php"

watch('app/(models|controllers)/(.*).php')  { |m| test_changed_model_or_controller(m[0]) }
watch('app/tests/cases/(models|controllers)/(.*).test.php')  { |m| test_changed_test_case(m[0]) }
watch('app/config/(.*).php') { |m| test_app() }
watch('app/(app_controller|app_model).php')  { |m| test_app() }

def test_changed_model_or_controller(file)
  type = file.split('/')[1]
  name = file.split('/')[2].split('.')[0]
  run "#{$cake} testsuite app case #{type}/#{name}" 
end

def test_changed_test_case(file)
  type = file.split('/')[3]
  name = file.split('/')[4].split('.')[0]
  run "#{$cake} testsuite app case #{type}/#{name}"
end

def test_app()
  run "#{$cake} testsuite app all"
end

def run(cmd) 
  puts(cmd)
  result = `#{cmd}`
  growl result rescue nil
  puts result
end

def growl(message)
  message = message.split('---------------------------------------------------------------')[3].split('Time taken by tests')[0]
  growlnotify = `which growlnotify`.chomp
  image = message.include?('fails') ? "~/.watchr_images/failed.png" : "~/.watchr_images/passed.png"
  options = "-w -n Watchr --image '#{File.expand_path(image)}' -m '#{message}'"
  system %(#{growlnotify} #{options} &)
end

#source 1: http://gist.github.com/276317
#source 2: http://bjhess.com/blog/2010/2/23/setting_up_watchr_and_rails/
#source 3: http://www.rubyinside.com/watchr-generic-autotest-alternativ-2511.html
#source 4: http://github.com/mynyml/watchr/blob/master/README.md
#source 5: http://book.cakephp.org/view/863/Running-tests-in-the-Command-Line