Add an example to assert the service

spec/classes/bind_spec.rb

@@ -7,11 +7,19 @@ describe 'bind' do
   context 'on Debian-derived systems' do
     let(:facts) { super().merge({ :osfamily => 'Debian' }) }
     
-    it { should contain_package('bind').with({
+    it {
+       should contain_package('bind').with({
         'ensure' => 'latest',
         'name' => 'bind9'
       })
     }
+
+    it {
+      should contain_service('bind').with({
+        'ensure' => 'running',
+        'name' => 'bind9'
+      })
+    }
   end
 
 end