group 'test' do
  guard 'minitest' do
    watch(%r|^test/(.*)_test\.rb|)
    watch(%r{^lib/(.*/)?([^/]+)\.rb$}) { |m| "test/#{m[1]}#{m[2]}_test.rb" }
    watch(%r|^test/test_helper\.rb|)   { "test" }
  end
end