Guardfile

# vim:set filetype=ruby:
guard(
  "rspec",
  all_after_pass: false,
  cmd: "bundle exec rspec --fail-fast --tty --format documentation --colour") do

  watch(%r{^spec/.+_spec\.rb$})
  watch(%r{^lib/(.+)\.rb$}) { |match| "spec/#{match[1]}_spec.rb" }
end