Guardfile
guard :rubocop do
watch(/.+\.rb$/)
watch(%r{(?:.+/)?\.rubocop(?:_todo)?\.yml$}) { |m| File.dirname(m[0]) }
end
guard :test, cmd: 'bundle exec rake test' do
watch(%r{^lib/(.*/)?([^/]+)\.rb$}) { |m| "test/#{m[1]}#{m[2]}_test.rb" }
watch(%r{^test/(.*)\/?(.*)_test\.rb$})
watch(%r{^test/test_helper\.rb$}) { 'test' }
end