Guardfile
guard :rspec, cmd: 'bundle exec rspec' do
watch('spec/spec_helper.rb') { "spec" }
watch(%r{^spec/.+_spec\.rb$})
watch(%r{^app/(.+)\.rb$}) { |m| "spec/#{m[1]}_spec.rb" }
watch(%r{^app/(.*)(\.erb|\.haml|\.slim)$}) { |m| "spec/#{m[1]}#{m[2]}_spec.rb" }
watch(%r{^app/models/filterer/(.+)\.rb$}) { |m| "app/models/filterer/#{m[1]}_spec.rb" }
watch(%r{^lib/filterer/(.+)\.rb$}) { |m| "spec/lib/filterer/#{m[1]}_spec.rb" }
end