old_contents: #!/usr/bin/env python3
  # Copyright (c) 2015-2017 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 node responses to invalid transactions.
  
  In this test we connect to one node over p2p, and test tx requests."""
  from test_framework.blocktools import create_block, create_coinbase, create_transaction
  from test_framework.messages import COIN
  from test_framework.mininode import network_thread_start, P2PDataStore
  from test_framework.test_framework import BitcoinTestFramework
  
  class InvalidTxRequestTest(BitcoinTestFramework):
  
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
          self.extra_args = [["-whitelist=127.0.0.1"]]
  
      def run_test(self):
          # Add p2p connection to node0
          node = self.nodes[0]  # convenience reference to the node
          node.add_p2p_connection(P2PDataStore())
  
          network_thread_start()
          node.p2p.wait_for_verack()
  
          best_block = self.nodes[0].getbestblockhash()
          tip = int(best_block, 16)
          best_block_time = self.nodes[0].getblock(best_block)['time']
          block_time = best_block_time + 1
  
          self.log.info("Create a new block with an anyone-can-spend coinbase.")
          height = 1
          block = create_block(tip, create_coinbase(height), block_time)
          block.solve()
          # Save the coinbase for later
          block1 = block
          tip = block.sha256
          node.p2p.send_blocks_and_test([block], node, success=True)
  
          self.log.info("Mature the block.")
          self.nodes[0].generate(100)
  
          # b'\x64' is OP_NOTIF
          # Transaction will be rejected with code 16 (REJECT_INVALID)
          tx1 = create_transaction(block1.vtx[0], 0, b'\x64', 50 * COIN - 12000)
          node.p2p.send_txs_and_test([tx1], node, success=False, reject_code=16, reject_reason=b'mandatory-script-verify-flag-failed (Invalid OP_IF construction)')
  
          # Verify valid transaction
          tx1 = create_transaction(block1.vtx[0], 0, b'', 50 * COIN - 12000)
          node.p2p.send_txs_and_test([tx1], node, success=True)
  
  
  if __name__ == '__main__':
      InvalidTxRequestTest().main()
  
new_contents: #!/usr/bin/env python3
  # Copyright (c) 2015-2017 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 node responses to invalid transactions.
  
  In this test we connect to one node over p2p, and test tx requests."""
  import time
  
  from test_framework.blocktools import create_block, create_coinbase, create_transaction
  from test_framework.comptool import RejectResult, TestInstance, TestManager
  from test_framework.messages import COIN
  from test_framework.mininode import network_thread_start
  from test_framework.test_framework import ComparisonTestFramework
  
  class InvalidTxRequestTest(ComparisonTestFramework):
  
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
  
      def run_test(self):
          test = TestManager(self, self.options.tmpdir)
          test.add_all_connections(self.nodes)
          self.tip = None
          self.block_time = None
          network_thread_start()
          test.run()
  
      def get_tests(self):
          self.tip = int("0x" + self.nodes[0].getbestblockhash(), 0)
          self.block_time = int(time.time()) + 1
  
          self.log.info("Create a new block with an anyone-can-spend coinbase.")
          height = 1
          block = create_block(self.tip, create_coinbase(height), self.block_time)
          self.block_time += 1
          block.solve()
          # Save the coinbase for later
          self.block1 = block
          self.tip = block.sha256
          height += 1
          yield TestInstance([[block, True]])
  
          self.log.info("Mature the block.")
          test = TestInstance(sync_every_block=False)
          for i in range(100):
              block = create_block(self.tip, create_coinbase(height), self.block_time)
              block.solve()
              self.tip = block.sha256
              self.block_time += 1
              test.blocks_and_transactions.append([block, True])
              height += 1
          yield test
  
          # b'\x64' is OP_NOTIF
          # Transaction will be rejected with code 16 (REJECT_INVALID)
          tx1 = create_transaction(self.block1.vtx[0], 0, b'\x64', 50 * COIN - 12000)
          yield TestInstance([[tx1, RejectResult(16, b'mandatory-script-verify-flag-failed')]])
  
          # TODO: test further transactions...
  
  if __name__ == '__main__':
      InvalidTxRequestTest().main()
  
subject: Fix flake8 warnings in invalidtxrequest