add test to fail if hostinterfaceitem is set to fqdn

Author: Braxton Schafer

spec/classes/agent_spec.rb

@@ -154,6 +154,16 @@
         it { is_expected.to contain_file(config_path).with_content %r{^HostInterfaceItem=system.hostname$} }
       end
 
+      context 'configuration file with hostinterfaceitem set to fqdn' do
+        let :params do
+          {
+            hostinterfaceitem: 'zabbix.example.com'
+          }
+        end
+
+        it { should not compile }
+      end
+
       context 'configuration file with hostinterface' do
         let :params do
           {