text: #!/usr/bin/env python3
  # Copyright (c) 2014-2016 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 the zapwallettxes functionality.
  
  - start three bitcoind nodes
  - create four transactions on node 0 - two are confirmed and two are
    unconfirmed.
  - restart node 1 and verify that both the confirmed and the unconfirmed
    transactions are still available.
  - restart node 0 and verify that the confirmed transactions are still
    available, but that the unconfirmed transaction has been zapped.
  """
  from test_framework.test_framework import BitcoinTestFramework
  from test_framework.util import *
  
  
  class ZapWalletTXesTest (BitcoinTestFramework):
  
      def __init__(self):
          super().__init__()
          self.setup_clean_chain = True
          self.num_nodes = 3
  
      def setup_network(self, split=False):
          self.nodes = start_nodes(self.num_nodes, self.options.tmpdir)
          connect_nodes_bi(self.nodes,0,1)
          connect_nodes_bi(self.nodes,1,2)
          connect_nodes_bi(self.nodes,0,2)
          self.is_network_split=False
          self.sync_all()
  
      def run_test (self):
          self.log.info("Mining blocks...")
          self.nodes[0].generate(1)
          self.sync_all()
          self.nodes[1].generate(101)
          self.sync_all()
          
          assert_equal(self.nodes[0].getbalance(), 50)
          
          txid0 = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 11)
          txid1 = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 10)
          self.sync_all()
          self.nodes[0].generate(1)
          self.sync_all()
          
          txid2 = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 11)
          txid3 = self.nodes[0].sendtoaddress(self.nodes[2].getnewaddress(), 10)
          
          tx0 = self.nodes[0].gettransaction(txid0)
          assert_equal(tx0['txid'], txid0) #tx0 must be available (confirmed)
          
          tx1 = self.nodes[0].gettransaction(txid1)
          assert_equal(tx1['txid'], txid1) #tx1 must be available (confirmed)
          
          tx2 = self.nodes[0].gettransaction(txid2)
          assert_equal(tx2['txid'], txid2) #tx2 must be available (unconfirmed)
          
          tx3 = self.nodes[0].gettransaction(txid3)
          assert_equal(tx3['txid'], txid3) #tx3 must be available (unconfirmed)
          
          #restart bitcoind
          self.nodes[0].stop()
          bitcoind_processes[0].wait()
          self.nodes[0] = start_node(0,self.options.tmpdir)
          
          tx3 = self.nodes[0].gettransaction(txid3)
          assert_equal(tx3['txid'], txid3) #tx must be available (unconfirmed)
          
          self.nodes[0].stop()
          bitcoind_processes[0].wait()
          
          #restart bitcoind with zapwallettxes
          self.nodes[0] = start_node(0,self.options.tmpdir, ["-zapwallettxes=1"])
          
          assert_raises(JSONRPCException, self.nodes[0].gettransaction, [txid3])
          #there must be a expection because the unconfirmed wallettx0 must be gone by now
  
          tx0 = self.nodes[0].gettransaction(txid0)
          assert_equal(tx0['txid'], txid0) #tx0 (confirmed) must still be available because it was confirmed
  
  
  if __name__ == '__main__':
      ZapWalletTXesTest ().main ()
  