new_contents: #!/usr/bin/env python
  """
  Copyright 2015 Brocade Communications Inc.
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
  http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  """
  
  
  import unittest
  import xml.etree.ElementTree as ET
  import pynos.versions.base.system as system
  import pynos.utilities
  
  
  class TestSystem(unittest.TestCase):
      """
      System unit tests. Compare expected XML to generated XML.
      """
      def setUp(self):
          self.system = system.System(pynos.utilities.return_xml)
          self.namespace = 'urn:brocade.com:mgmt:brocade-system'
          self.netconf_namespace = 'urn:ietf:params:xml:ns:netconf:base:1.0'
          self.rbridge_namespace = 'urn:brocade.com:mgmt:brocade-rbridge'
  
      def uptime_xml(self, *args, **kwargs):
          message_id = 'urn:uuid:528cdf32-2e86-11e5-bb27-080027b782e4'
          uptime_xml = '<ns0:rpc-reply xmlns:ns0="{0}" '\
                       'xmlns:ns1="{1}" message-id="{2}">'\
                       '<ns1:show-system-uptime><ns1:rbridge-id>226'\
                       '</ns1:rbridge-id><ns1:days>1</ns1:days><ns1:hours>21'\
                       '</ns1:hours><ns1:minutes>59</ns1:minutes><ns1:seconds>'\
                       '57</ns1:seconds></ns1:show-system-uptime>'\
                       '</ns0:rpc-reply>'.format(self.netconf_namespace,
                                                 self.namespace,
                                                 message_id)
          return ET.fromstring(uptime_xml)
  
      def test_uptime(self):
          expected = {'days': '1',
                      'hours': '21',
                      'minutes': '59',
                      'seconds': '57'}
          self.system._callback = self.uptime_xml
          results = self.system.uptime
          self.assertDictEqual(expected, results)
  
      def test_router_id(self):
          rtm_namespace = 'urn:brocade.com:mgmt:brocade-rtm'
          expected = '<config><rbridge-id xmlns="{0}"><rbridge-id>2'\
                     '</rbridge-id><ip><rtm-config xmlns="{1}"><router-id>'\
                     '10.10.10.10</router-id></rtm-config></ip></rbridge-id>'\
                     '</config>'.format(self.rbridge_namespace, rtm_namespace)
          result = self.system.router_id(rbridge_id='2', router_id='10.10.10.10')
          result = ET.tostring(result)
          self.assertEquals(expected, result)
  
      def test_router_id_exception(self):
          with self.assertRaises(KeyError):
              self.system.router_id()
  
subject: Add unit tests for System