text: #!/usr/bin/env python3
  # Copyright (c) 2017-2018 The Stancecoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test HD Wallet keypool restore function.
  
  Two nodes. Node1 is under test. Node0 is providing transactions and generating blocks.
  
  - Start node1, shutdown and backup wallet.
  - Generate 110 keys (enough to drain the keypool). Store key 90 (in the initial keypool) and key 110 (beyond the initial keypool). Send funds to key 90 and key 110.
  - Stop node1, clear the datadir, move wallet file back into the datadir and restart node1.
  - connect node1 to node0. Verify that they sync and node1 receives its funds."""
  import os
  import shutil
  
  from test_framework.test_framework import StancecoinTestFramework
  from test_framework.util import (
      assert_equal,
      connect_nodes_bi,
      sync_blocks,
  )
  
  
  class KeypoolRestoreTest(StancecoinTestFramework):
      def set_test_params(self):
          self.setup_clean_chain = True
          self.num_nodes = 2
          self.extra_args = [[], ['-keypool=100']]
  
      def run_test(self):
          wallet_path = os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat")
          wallet_backup_path = os.path.join(self.nodes[1].datadir, "wallet.bak")
          self.nodes[0].generate(101)
  
          self.log.info("Make backup of wallet")
          self.stop_node(1)
          shutil.copyfile(wallet_path, wallet_backup_path)
          self.start_node(1, self.extra_args[1])
          connect_nodes_bi(self.nodes, 0, 1)
  
          self.log.info("Generate keys for wallet")
          for _ in range(90):
              addr_oldpool = self.nodes[1].getnewaddress()
          for _ in range(20):
              addr_extpool = self.nodes[1].getnewaddress()
  
          self.log.info("Send funds to wallet")
          self.nodes[0].sendtoaddress(addr_oldpool, 10)
          self.nodes[0].generate(1)
          self.nodes[0].sendtoaddress(addr_extpool, 5)
          self.nodes[0].generate(1)
          sync_blocks(self.nodes)
  
          self.log.info("Restart node with wallet backup")
          self.stop_node(1)
          shutil.copyfile(wallet_backup_path, wallet_path)
          self.start_node(1, self.extra_args[1])
          connect_nodes_bi(self.nodes, 0, 1)
          self.sync_all()
  
          self.log.info("Verify keypool is restored and balance is correct")
          assert_equal(self.nodes[1].getbalance(), 15)
          assert_equal(self.nodes[1].listtransactions()[0]['category'], "receive")
          # Check that we have marked all keys up to the used keypool key as used
          assert_equal(self.nodes[1].getaddressinfo(self.nodes[1].getnewaddress())['hdkeypath'], "m/0'/0'/110'")
  
  
  if __name__ == '__main__':
      KeypoolRestoreTest().main()
  