text: #!/usr/bin/env python3
  #
  #  Copyright (c) 2016, The OpenThread Authors.
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  #     derived from this software without specific prior written permission.
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  #  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  #  POSSIBILITY OF SUCH DAMAGE.
  #
  
  import unittest
  
  import config
  import node
  
  CHANNEL1 = 11
  CHANNEL2 = 18
  CHANNEL_MASK = 1 << 18
  PANID_INIT = 0xface
  
  LEADER1 = 1
  LEADER2 = 2
  ED1 = 3
  
  
  class Cert_9_2_17_Orphan(unittest.TestCase):
      def setUp(self):
          self.simulator = config.create_default_simulator()
  
          self.nodes = {}
          for i in range(1, 4):
              self.nodes[i] = node.Node(i, (i == ED1), simulator=self.simulator)
  
          self.nodes[LEADER1].set_active_dataset(
              10, channel=CHANNEL1, panid=PANID_INIT, channel_mask=CHANNEL_MASK
          )
          self.nodes[LEADER1].set_mode('rsdn')
          self.nodes[LEADER1].add_whitelist(self.nodes[ED1].get_addr64())
          self.nodes[LEADER1].enable_whitelist()
          self.nodes[LEADER1].set_router_selection_jitter(1)
  
          self.nodes[LEADER2].set_active_dataset(
              20, channel=CHANNEL2, panid=PANID_INIT, channel_mask=CHANNEL_MASK
          )
          self.nodes[LEADER2].set_mode('rsdn')
          self.nodes[LEADER2].enable_whitelist()
          self.nodes[LEADER2].set_router_selection_jitter(1)
  
          self.nodes[ED1].set_channel(CHANNEL1)
          self.nodes[ED1].set_mode('rsn')
          self.nodes[ED1].set_panid(PANID_INIT)
          self.nodes[ED1].add_whitelist(self.nodes[LEADER1].get_addr64())
          self.nodes[ED1].enable_whitelist()
          self.nodes[ED1].set_timeout(config.DEFAULT_CHILD_TIMEOUT)
  
      def tearDown(self):
          for n in list(self.nodes.values()):
              n.stop()
              n.destroy()
          self.simulator.stop()
  
      def test(self):
          self.nodes[LEADER1].start()
          self.simulator.go(5)
          self.assertEqual(self.nodes[LEADER1].get_state(), 'leader')
  
          self.nodes[LEADER2].start()
          self.nodes[LEADER2].set_state('leader')
          self.assertEqual(self.nodes[LEADER2].get_state(), 'leader')
  
          self.nodes[ED1].start()
          self.simulator.go(5)
          self.assertEqual(self.nodes[ED1].get_state(), 'child')
  
          self.nodes[LEADER1].stop()
          self.nodes[LEADER2].add_whitelist(self.nodes[ED1].get_addr64())
          self.nodes[ED1].add_whitelist(self.nodes[LEADER2].get_addr64())
          self.simulator.go(20)
  
          self.assertEqual(self.nodes[ED1].get_state(), 'child')
          self.assertEqual(self.nodes[ED1].get_channel(), CHANNEL2)
  
  
  if __name__ == '__main__':
      unittest.main()
  