guard :minitest do
  # with Minitest::Unit
  watch(%r{^test/(.*)\/?test_(.*)\.rb})
  watch(%r{^lib/(.*/)?([^/]+)\.rb})     { |m| "test/#{m[1]}test_#{m[2]}.rb" }
  watch(%r{^test/test_helper\.rb})      { 'test' }
end