text: #!/usr/bin/env python3
  # Copyright (c) 2014-2016 The Machinecoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #
  # Test the BIP66 changeover logic
  #
  
  from test_framework.test_framework import MachinecoinTestFramework
  from test_framework.util import *
  
  class BIP66Test(MachinecoinTestFramework):
      def __init__(self):
          super().__init__()
          self.num_nodes = 3
          self.setup_clean_chain = False
  
      def setup_network(self):
          self.nodes = []
          self.nodes.append(start_node(0, self.options.tmpdir, []))
          self.nodes.append(start_node(1, self.options.tmpdir, ["-blockversion=2"]))
          self.nodes.append(start_node(2, self.options.tmpdir, ["-blockversion=3"]))
          connect_nodes(self.nodes[1], 0)
          connect_nodes(self.nodes[2], 0)
          self.is_network_split = False
          self.sync_all()
  
      def run_test(self):
          cnt = self.nodes[0].getblockcount()
  
          # Mine some old-version blocks
          self.nodes[1].generate(100)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 100):
              raise AssertionError("Failed to mine 100 version=2 blocks")
  
          # Mine 750 new-version blocks
          for i in range(15):
              self.nodes[2].generate(50)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 850):
              raise AssertionError("Failed to mine 750 version=3 blocks")
  
          # TODO: check that new DERSIG rules are not enforced
  
          # Mine 1 new-version block
          self.nodes[2].generate(1)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 851):
              raise AssertionError("Failed to mine a version=3 blocks")
  
          # TODO: check that new DERSIG rules are enforced
  
          # Mine 198 new-version blocks
          for i in range(2):
              self.nodes[2].generate(99)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 1049):
              raise AssertionError("Failed to mine 198 version=3 blocks")
  
          # Mine 1 old-version block
          self.nodes[1].generate(1)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 1050):
              raise AssertionError("Failed to mine a version=2 block after 949 version=3 blocks")
  
          # Mine 1 new-version blocks
          self.nodes[2].generate(1)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 1051):
              raise AssertionError("Failed to mine a version=3 block")
  
          # Mine 1 old-version blocks
          try:
              self.nodes[1].generate(1)
              raise AssertionError("Succeeded to mine a version=2 block after 950 version=3 blocks")
          except JSONRPCException:
              pass
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 1051):
              raise AssertionError("Accepted a version=2 block after 950 version=3 blocks")
  
          # Mine 1 new-version blocks
          self.nodes[2].generate(1)
          self.sync_all()
          if (self.nodes[0].getblockcount() != cnt + 1052):
              raise AssertionError("Failed to mine a version=3 block")
  
  if __name__ == '__main__':
      BIP66Test().main()
  