text: #!/usr/bin/env python3
  # Copyright (c) 2016 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  from test_framework.test_framework import BitcoinTestFramework
  from test_framework.util import (
      start_nodes,
      start_node,
      assert_equal,
      connect_nodes_bi,
  )
  import os
  import shutil
  
  
  class WalletHDTest(BitcoinTestFramework):
  
      def __init__(self):
          super().__init__()
          self.setup_clean_chain = True
          self.num_nodes = 2
          self.node_args = [['-usehd=0'], ['-usehd=1', '-keypool=0']]
  
      def setup_network(self):
          self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, self.node_args)
          self.is_network_split = False
          connect_nodes_bi(self.nodes, 0, 1)
  
      def run_test (self):
          tmpdir = self.options.tmpdir
  
          # Make sure we use hd, keep masterkeyid
          masterkeyid = self.nodes[1].getwalletinfo()['hdmasterkeyid']
          assert_equal(len(masterkeyid), 40)
  
          # Import a non-HD private key in the HD wallet
          non_hd_add = self.nodes[0].getnewaddress()
          self.nodes[1].importprivkey(self.nodes[0].dumpprivkey(non_hd_add))
  
          # This should be enough to keep the master key and the non-HD key 
          self.nodes[1].backupwallet(tmpdir + "/hd.bak")
          #self.nodes[1].dumpwallet(tmpdir + "/hd.dump")
  
          # Derive some HD addresses and remember the last
          # Also send funds to each add
          # First blocks with main amount
          self.nodes[0].generate(10)
          # Other blocks with reward amount
          self.nodes[0].generate(100)
          hd_add = None
          num_hd_adds = 300
          for i in range(num_hd_adds):
              hd_add = self.nodes[1].getnewaddress()
              hd_info = self.nodes[1].validateaddress(hd_add)
              assert_equal(hd_info["hdkeypath"], "m/0'/0'/"+str(i+1)+"'")
              assert_equal(hd_info["hdmasterkeyid"], masterkeyid)
              self.nodes[0].sendtoaddress(hd_add, 1)
              self.nodes[0].generate(1)
          self.nodes[0].sendtoaddress(non_hd_add, 1)
          self.nodes[0].generate(1)
  
          self.sync_all()
          assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
  
          print("Restore backup ...")
          self.stop_node(1)
          os.remove(self.options.tmpdir + "/node1/regtest/wallet.dat")
          shutil.copyfile(tmpdir + "/hd.bak", tmpdir + "/node1/regtest/wallet.dat")
          self.nodes[1] = start_node(1, self.options.tmpdir, self.node_args[1])
          #connect_nodes_bi(self.nodes, 0, 1)
  
          # Assert that derivation is deterministic
          hd_add_2 = None
          for _ in range(num_hd_adds):
              hd_add_2 = self.nodes[1].getnewaddress()
              hd_info_2 = self.nodes[1].validateaddress(hd_add_2)
              assert_equal(hd_info_2["hdkeypath"], "m/0'/0'/"+str(_+1)+"'")
              assert_equal(hd_info_2["hdmasterkeyid"], masterkeyid)
          assert_equal(hd_add, hd_add_2)
  
          # Needs rescan
          self.stop_node(1)
          self.nodes[1] = start_node(1, self.options.tmpdir, self.node_args[1] + ['-rescan'])
          #connect_nodes_bi(self.nodes, 0, 1)
          assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
  
  
  if __name__ == '__main__':
      WalletHDTest().main ()
  