switch to use case I actually use

spec/acceptance/suites/default/redis_deferred_spec.rb

@@ -10,13 +10,18 @@ class { 'redis':
         manage_repo    => true,
         redis_apt_repo => true,
         port           => 10001,
-        masterauth     => Deferred('inline_epp',['<%= $pass %>\n',{'pass' => 'topsecret'}]),
+        requirepass    => Deferred('inline_epp',['<%= $pass %>',{'pass' => 'topsecret'}]),
       }
       PUPPET
     end
   end
 
   describe command('redis-cli -p 10001 -a topsecret ping') do
+    its(:exit_status) { is_expected.to eq 0 }
     its(:stdout) { is_expected.to match %r{PONG} }
   end
+
+  describe command('redis-cli -p 10001 -a nonsense ping') do
+    its(:stdout) { is_expected.not_to match %r{PONG} }
+  end
 end