test(inspec): add test for `log_format` #219

test/integration/default/controls/config.rb

     it { should be_owned_by 'root' }
     it { should be_grouped_into 'root' }
     its('mode') { should cmp '0644' }
+    its('content') { should include %Q[    log_format main '$remote_addr - $remote_user [$time_local] $status '
+                    '"$request" $body_bytes_sent "$http_referer" '
+                    '"$http_user_agent" "$http_x_forwarded_for"';] }
   end
 
   # snippets configuration

test/salt/default/pillar/nginx.sls

       letsencrypt:
         - location ^~ /.well-known/acme-challenge/:
           - proxy_pass: http://localhost:9999
+    server:
+      config:
+        http:
+          ### module ngx_http_log_module example
+          log_format: |-
+            main '$remote_addr - $remote_user [$time_local] $status '
+                                '"$request" $body_bytes_sent "$http_referer" '
+                                '"$http_user_agent" "$http_x_forwarded_for"'
     servers:
       managed:
         default: