text: #!/usr/bin/env python3
  # Copyright (c) 2017-2020 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 that the wallet resends transactions periodically."""
  import time
  
  from test_framework.blocktools import create_block, create_coinbase
  from test_framework.messages import ToHex
  from test_framework.p2p import P2PTxInvStore
  from test_framework.test_framework import BitcoinTestFramework
  from test_framework.util import assert_equal
  
  
  class ResendWalletTransactionsTest(BitcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
  
      def run_test(self):
          node = self.nodes[0]  # alias
  
          peer_first = node.add_p2p_connection(P2PTxInvStore())
  
          self.log.info("Create a new transaction and wait until it's broadcast")
          txid = node.sendtoaddress(node.getnewaddress(), 1)
  
          # Wallet rebroadcast is first scheduled 1 sec after startup (see
          # nNextResend in ResendWalletTransactions()). Tell scheduler to call
          # MaybeResendWalletTxn now to initialize nNextResend before the first
          # setmocktime call below.
          node.mockscheduler(1)
  
          # Can take a few seconds due to transaction trickling
          peer_first.wait_for_broadcast([txid])
  
          # Add a second peer since txs aren't rebroadcast to the same peer (see filterInventoryKnown)
          peer_second = node.add_p2p_connection(P2PTxInvStore())
  
          self.log.info("Create a block")
          # Create and submit a block without the transaction.
          # Transactions are only rebroadcast if there has been a block at least five minutes
          # after the last time we tried to broadcast. Use mocktime and give an extra minute to be sure.
          block_time = int(time.time()) + 6 * 60
          node.setmocktime(block_time)
          block = create_block(int(node.getbestblockhash(), 16), create_coinbase(node.getblockcount() + 1), block_time)
          block.nVersion = 0x20000000
          block.rehash()
          block.solve()
          node.submitblock(ToHex(block))
  
          node.syncwithvalidationinterfacequeue()
          now = int(time.time())
  
          # Transaction should not be rebroadcast within first 12 hours
          # Leave 2 mins for buffer
          twelve_hrs = 12 * 60 * 60
          two_min = 2 * 60
          node.setmocktime(now + twelve_hrs - two_min)
          node.mockscheduler(1)  # Tell scheduler to call MaybeResendWalletTxn now
          assert_equal(int(txid, 16) in peer_second.get_invs(), False)
  
          self.log.info("Bump time & check that transaction is rebroadcast")
          # Transaction should be rebroadcast approximately 24 hours in the future,
          # but can range from 12-36. So bump 36 hours to be sure.
          with node.assert_debug_log(['ResendWalletTransactions: resubmit 1 unconfirmed transactions']):
              node.setmocktime(now + 36 * 60 * 60)
              # Tell scheduler to call MaybeResendWalletTxn now.
              node.mockscheduler(1)
          # Give some time for trickle to occur
          node.setmocktime(now + 36 * 60 * 60 + 600)
          peer_second.wait_for_broadcast([txid])
  
  
  if __name__ == '__main__':
      ResendWalletTransactionsTest().main()
  