Guardfile

guard 'spork' do
  watch('config/application.rb')
  watch('config/environment.rb')
  watch('config/environments/test.rb')
  watch(%r{^config/initializers/.+\.rb$})
  watch('Gemfile')
  watch('Gemfile.lock')
  watch('test/test_helper.rb') { :test_unit }
end

guard :test do
  watch(%r{^lib/(.+)\.rb$})     { |m| "test/#{m[1]}_test.rb" }
  watch(%r{^test/.+_test\.rb$})
  watch('test/test_helper.rb')  { "test" }

  # Rails example
  watch(%r{^app/models/(.+)\.rb$})                   { |m| "test/unit/#{m[1]}_test.rb" }
  watch(%r{^app/controllers/(.+)\.rb$})              { |m| "test/functional/#{m[1]}_test.rb" }
  watch(%r{^app/views/.+\.rb$})                      { "test/integration" }
  watch('app/controllers/application_controller.rb') { ["test/functional", "test/integration"] }
end