Rubocop - unsafe autocorrections

Author: LukasAud

spec/acceptance/apt_key_provider_spec.rb

@@ -16,8 +16,8 @@
 PUPPETLABS_EXP_KEY_DATES            = 'pub:e:4096:1:1054B7A24BD6EC30:2010-07-10:2017-01-05::-:Puppet Labs Release Key'
 SHOULD_NEVER_EXIST_ID               = 'EF8D349F'
 KEY_CHECK_COMMAND                   = 'apt-key adv --no-tty --list-keys --with-colons --fingerprint | grep '
-PUPPETLABS_KEY_CHECK_COMMAND        = "#{KEY_CHECK_COMMAND} #{PUPPETLABS_GPG_KEY_FINGERPRINT}"
-CENTOS_KEY_CHECK_COMMAND            = "#{KEY_CHECK_COMMAND} #{CENTOS_GPG_KEY_FINGERPRINT}"
+PUPPETLABS_KEY_CHECK_COMMAND        = "#{KEY_CHECK_COMMAND} #{PUPPETLABS_GPG_KEY_FINGERPRINT}".freeze
+CENTOS_KEY_CHECK_COMMAND            = "#{KEY_CHECK_COMMAND} #{CENTOS_GPG_KEY_FINGERPRINT}".freeze
 PUPPETLABS_EXP_CHECK_COMMAND        = 'apt-key list | grep -F -A 1 \'pub   rsa4096 2010-07-10 [SC] [expired: 2017-01-05]\' | grep \'47B3 20EB 4C7C 375A A9DA  E1A0 1054 B7A2 4BD6 EC30\''
 
 def install_key(key)