text: #!/usr/bin/env python2
  # Copyright (c) 2014-2020 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 resurrection of mined transactions when
  # the blockchain is re-organized.
  #
  
  from test_framework import BitcoinTestFramework
  from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
  from util import *
  import os
  import shutil
  
  # Create one-input, one-output, no-fee transaction:
  class MempoolCoinbaseTest(BitcoinTestFramework):
  
      def setup_network(self):
          # Just need one node for this test
          args = ["-checkmempool", "-debug=mempool"]
          self.nodes = []
          self.nodes.append(start_node(0, self.options.tmpdir, args))
          self.is_network_split = False
  
      def create_tx(self, from_txid, to_address, amount):
          inputs = [{ "txid" : from_txid, "vout" : 0}]
          outputs = { to_address : amount }
          rawtx = self.nodes[0].createrawtransaction(inputs, outputs)
          signresult = self.nodes[0].signrawtransaction(rawtx)
          assert_equal(signresult["complete"], True)
          return signresult["hex"]
  
      def run_test(self):
          node0_address = self.nodes[0].getnewaddress()
  
          # Spend block 1/2/3's coinbase transactions
          # Mine a block.
          # Create three more transactions, spending the spends
          # Mine another block.
          # ... make sure all the transactions are confirmed
          # Invalidate both blocks
          # ... make sure all the transactions are put back in the mempool
          # Mine a new block
          # ... make sure all the transactions are confirmed again.
  
          b = [ self.nodes[0].getblockhash(n) for n in range(1, 4) ]
          coinbase_txids = [ self.nodes[0].getblock(h)['tx'][0] for h in b ]
          spends1_raw = [ self.create_tx(txid, node0_address, 50) for txid in coinbase_txids ]
          spends1_id = [ self.nodes[0].sendrawtransaction(tx) for tx in spends1_raw ]
  
          blocks = []
          blocks.extend(self.nodes[0].setgenerate(True, 1))
  
          spends2_raw = [ self.create_tx(txid, node0_address, 49.99) for txid in spends1_id ]
          spends2_id = [ self.nodes[0].sendrawtransaction(tx) for tx in spends2_raw ]
  
          blocks.extend(self.nodes[0].setgenerate(True, 1))
  
          # mempool should be empty, all txns confirmed
          assert_equal(set(self.nodes[0].getrawmempool()), set())
          for txid in spends1_id+spends2_id:
              tx = self.nodes[0].gettransaction(txid)
              assert(tx["confirmations"] > 0)
  
          # Use invalidateblock to re-org back; all transactions should
          # end up unconfirmed and back in the mempool
          for node in self.nodes:
              node.invalidateblock(blocks[0])
  
          # mempool should be empty, all txns confirmed
          assert_equal(set(self.nodes[0].getrawmempool()), set(spends1_id+spends2_id))
          for txid in spends1_id+spends2_id:
              tx = self.nodes[0].gettransaction(txid)
              assert(tx["confirmations"] == 0)
  
          # Generate another block, they should all get mined
          self.nodes[0].setgenerate(True, 1)
          # mempool should be empty, all txns confirmed
          assert_equal(set(self.nodes[0].getrawmempool()), set())
          for txid in spends1_id+spends2_id:
              tx = self.nodes[0].gettransaction(txid)
              assert(tx["confirmations"] > 0)
  
  
  if __name__ == '__main__':
      MempoolCoinbaseTest().main()
  