text: #!/usr/bin/env python3
  # Copyright (c) 2014-2016 The Gulden Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  # Exercise the getchaintips API.  We introduce a network split, work
  # on chains of different lengths, and join the network together again.
  # This gives us two tips, verify that it works.
  
  from test_framework.test_framework import GuldenTestFramework
  from test_framework.util import assert_equal
  
  class GetChainTipsTest (GuldenTestFramework):
      def __init__(self):
          super().__init__()
          self.num_nodes = 4
          self.setup_clean_chain = False
  
      def run_test (self):
  
          tips = self.nodes[0].getchaintips ()
          assert_equal (len (tips), 1)
          assert_equal (tips[0]['branchlen'], 0)
          assert_equal (tips[0]['height'], 200)
          assert_equal (tips[0]['status'], 'active')
  
          # Split the network and build two chains of different lengths.
          self.split_network ()
          self.nodes[0].generate(10)
          self.nodes[2].generate(20)
          self.sync_all ()
  
          tips = self.nodes[1].getchaintips ()
          assert_equal (len (tips), 1)
          shortTip = tips[0]
          assert_equal (shortTip['branchlen'], 0)
          assert_equal (shortTip['height'], 210)
          assert_equal (tips[0]['status'], 'active')
  
          tips = self.nodes[3].getchaintips ()
          assert_equal (len (tips), 1)
          longTip = tips[0]
          assert_equal (longTip['branchlen'], 0)
          assert_equal (longTip['height'], 220)
          assert_equal (tips[0]['status'], 'active')
  
          # Join the network halves and check that we now have two tips
          # (at least at the nodes that previously had the short chain).
          self.join_network ()
  
          tips = self.nodes[0].getchaintips ()
          assert_equal (len (tips), 2)
          assert_equal (tips[0], longTip)
  
          assert_equal (tips[1]['branchlen'], 10)
          assert_equal (tips[1]['status'], 'valid-fork')
          tips[1]['branchlen'] = 0
          tips[1]['status'] = 'active'
          assert_equal (tips[1], shortTip)
  
  if __name__ == '__main__':
      GetChainTipsTest ().main ()
  