text: #!/usr/bin/env python2
  # coding=utf-8
  # ^^^^^^^^^^^^ TODO remove when supporting only 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.
  """Test Hierarchical Deterministic wallet function."""
  
  from test_framework.test_framework import HiluxTestFramework
  from test_framework.util import *
  
  class WalletHDTest(HiluxTestFramework):
  
      def setup_chain(self):
          print("Initializing test directory "+self.options.tmpdir)
          initialize_chain_clean(self.options.tmpdir, 2)
  
      def setup_network(self):
          self.nodes = start_nodes(2, self.options.tmpdir, [['-usehd=0'], ['-usehd=1', '-keypool=0']])
          self.is_network_split = False
          connect_nodes_bi(self.nodes, 0, 1)
          self.is_network_split=False
          self.sync_all()
  
      def run_test (self):
          tmpdir = self.options.tmpdir
  
          # Make sure can't switch off usehd after wallet creation
          stop_node(self.nodes[1],1)
          try:
              start_node(1, self.options.tmpdir, ['-usehd=0'])
              raise AssertionError("Must not allow to turn off HD on an already existing HD wallet")
          except Exception as e:
              assert("hiluxd exited with status 1 during initialization" in str(e))
          # assert_start_raises_init_error(1, self.options.tmpdir, ['-usehd=0'], 'already existing HD wallet')
          # self.nodes[1] = start_node(1, self.options.tmpdir, self.node_args[1])
          self.nodes[1] = start_node(1, self.options.tmpdir, ['-usehd=1', '-keypool=0'])
          connect_nodes_bi(self.nodes, 0, 1)
  
          # Make sure we use hd, keep chainid
          chainid = self.nodes[1].getwalletinfo()['hdchainid']
          assert_equal(len(chainid), 64)
  
          # create an internal key
          change_addr = self.nodes[1].getrawchangeaddress()
          change_addrV= self.nodes[1].validateaddress(change_addr);
          assert_equal(change_addrV["hdkeypath"], "m/44'/1'/0'/1/0") #first internal child key
  
          # 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
          self.nodes[0].generate(101)
          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/44'/1'/0'/0/"+str(i+1))
              assert_equal(hd_info["hdchainid"], chainid)
              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)
  
          # create an internal key (again)
          change_addr = self.nodes[1].getrawchangeaddress()
          change_addrV= self.nodes[1].validateaddress(change_addr);
          assert_equal(change_addrV["hdkeypath"], "m/44'/1'/0'/1/1") #second internal child key
  
          self.sync_all()
          assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
  
          print("Restore backup ...")
          stop_node(self.nodes[1],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, ['-usehd=1', '-keypool=0'])
          #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/44'/1'/0'/0/"+str(_+1))
              assert_equal(hd_info_2["hdchainid"], chainid)
          assert_equal(hd_add, hd_add_2)
  
          # Needs rescan
          stop_node(self.nodes[1],1)
          self.nodes[1] = start_node(1, self.options.tmpdir, ['-usehd=1', '-keypool=0', '-rescan'])
          #connect_nodes_bi(self.nodes, 0, 1)
          assert_equal(self.nodes[1].getbalance(), num_hd_adds + 1)
  
          # send a tx and make sure its using the internal chain for the changeoutput
          txid = self.nodes[1].sendtoaddress(self.nodes[0].getnewaddress(), 1)
          outs = self.nodes[1].decoderawtransaction(self.nodes[1].gettransaction(txid)['hex'])['vout'];
          keypath = ""
          for out in outs:
              if out['value'] != 1:
                  keypath = self.nodes[1].validateaddress(out['scriptPubKey']['addresses'][0])['hdkeypath']
  
          assert_equal(keypath[0:13], "m/44'/1'/0'/1")
  
  if __name__ == '__main__':
      WalletHDTest().main ()
  