Added spec for comparing contents of keyring file

Author: praj1001

spec/acceptance/apt_keyring_spec.rb

@@ -2,6 +2,8 @@
 
 require 'spec_helper_acceptance'
 
+PUPPETLABS_KEYRING_CHECK_COMMAND = 'gpg --show-keys /etc/apt/keyrings/puppetlabs-keyring.gpg | grep -F -A 1 \'pub   rsa4096 2019-04-08 [SC] [expires: 2025-04-06]\' | grep \'D6811ED3ADEEB8441AF5AA8F4528B6CD9E61EF26\''
+
 describe 'apt::keyring' do
   context 'when using default values and source specified explicitly' do
     keyring_pp = <<-MANIFEST
@@ -16,8 +18,8 @@
       end
     end
 
-    it 'expects file to be present at default location' do
-      run_shell('rm /etc/apt/keyrings/puppetlabs-keyring.gpg')
+    it 'expects file content to be present and correct' do
+      run_shell(PUPPETLABS_KEYRING_CHECK_COMMAND.to_s)
     end
   end
 end