new_contents: import testtools
  import dcclient.xml_manager.manager as mg
  import dcclient.xml_manager.data_structures as ds
  
  
  class main_test(testtools.TestCase):
      def test_findVlan(self):
          # tests if none type is return when vlan is not found
          xml = mg.ManagedXml()
  
          answer = xml.findVlan(61)
          self.assertIs(answer, None)
  
          # tests if Vlan_global object is return when vlan is found
          xml.addVlan(60, name='vlan_test', ports=[1, 5, 9])
  
          answer = xml.findVlan(60)
          self.assertIsInstance(answer, ds.Vlan_global)
  
          # tests if found vlan xml is correct
          expected_xml = '<vlan_global id0="60"><vid>60</vid><active>1' + \
                         '</active><name>vlan_test</name>' + \
                         '<pbmp_untagged id0="0"><pbits id0="0">273</pbits>' + \
                         '</pbmp_untagged></vlan_global>'
  
          self.assertEquals(expected_xml, answer.as_xml_text())
  
subject: Add test for manager.py