text: #!/usr/bin/env python3
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  import unittest
  
  import command
  import mle
  import thread_cert
  from command import CheckType
  
  LEADER = 1
  ROUTER1 = 2
  
  
  class Cert_5_1_06_RemoveRouterId(thread_cert.TestCase):
      TOPOLOGY = {
          LEADER: {
              'mode': 'rsdn',
              'panid': 0xface,
              'whitelist': [ROUTER1]
          },
          ROUTER1: {
              'mode': 'rsdn',
              'panid': 0xface,
              'router_selection_jitter': 1,
              'whitelist': [LEADER]
          },
      }
  
      def test(self):
          self.nodes[LEADER].start()
          self.simulator.go(5)
          self.assertEqual(self.nodes[LEADER].get_state(), 'leader')
  
          self.nodes[ROUTER1].start()
          self.simulator.go(5)
          self.assertEqual(self.nodes[ROUTER1].get_state(), 'router')
          rloc16 = self.nodes[ROUTER1].get_addr16()
  
          for addr in self.nodes[ROUTER1].get_addrs():
              self.assertTrue(self.nodes[LEADER].ping(addr))
  
          self.nodes[LEADER].release_router_id(rloc16 >> 10)
          self.simulator.go(5)
          self.assertEqual(self.nodes[ROUTER1].get_state(), 'router')
  
          leader_messages = self.simulator.get_messages_sent_by(LEADER)
          router1_messages = self.simulator.get_messages_sent_by(ROUTER1)
  
          # 1 - All
          leader_messages.next_mle_message(mle.CommandType.ADVERTISEMENT)
  
          router1_messages.next_mle_message(mle.CommandType.PARENT_REQUEST)
          leader_messages.next_mle_message(mle.CommandType.PARENT_RESPONSE)
  
          router1_messages.next_mle_message(mle.CommandType.CHILD_ID_REQUEST)
          leader_messages.next_mle_message(mle.CommandType.CHILD_ID_RESPONSE)
  
          msg = router1_messages.next_coap_message("0.02")
          msg.assertCoapMessageRequestUriPath("/a/as")
  
          leader_messages.next_coap_message("2.04")
  
          # 2 - N/A
  
          # 3 - Router1
          msg = router1_messages.next_mle_message(mle.CommandType.PARENT_REQUEST)
          command.check_parent_request(msg, is_first_request=True)
  
          msg = router1_messages.next_mle_message(
              mle.CommandType.CHILD_ID_REQUEST, sent_to_node=self.nodes[LEADER])
          command.check_child_id_request(
              msg,
              tlv_request=CheckType.CONTAIN,
              mle_frame_counter=CheckType.OPTIONAL,
              address_registration=CheckType.NOT_CONTAIN,
              active_timestamp=CheckType.OPTIONAL,
              pending_timestamp=CheckType.OPTIONAL,
          )
  
          msg = router1_messages.next_coap_message(code="0.02")
          command.check_address_solicit(msg, was_router=True)
  
          # 4 - Router1
          for addr in self.nodes[ROUTER1].get_addrs():
              self.assertTrue(self.nodes[LEADER].ping(addr))
  
  
  if __name__ == '__main__':
      unittest.main()
  