text: #!/usr/bin/env python3
  # Copyright (c) 2016-2020 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 NULLDUMMY softfork.
  
  Connect to a single node.
  Generate 2 blocks (save the coinbases for later).
  Generate COINBASE_MATURITY (CB) more blocks to ensure the coinbases are mature.
  [Policy/Consensus] Check that NULLDUMMY compliant transactions are accepted in block CB + 3.
  [Policy] Check that non-NULLDUMMY transactions are rejected before activation.
  [Consensus] Check that the new NULLDUMMY rules are not enforced on block CB + 4.
  [Policy/Consensus] Check that the new NULLDUMMY rules are enforced on block CB + 5.
  """
  import time
  
  from test_framework.blocktools import (
      COINBASE_MATURITY,
      NORMAL_GBT_REQUEST_PARAMS,
      add_witness_commitment,
      create_block,
      create_transaction,
  )
  from test_framework.messages import CTransaction
  from test_framework.script import CScript
  from test_framework.test_framework import TechcoinTestFramework
  from test_framework.util import (
      assert_equal,
      assert_raises_rpc_error,
  )
  
  NULLDUMMY_ERROR = "non-mandatory-script-verify-flag (Dummy CHECKMULTISIG argument must be zero)"
  
  
  def trueDummy(tx):
      scriptSig = CScript(tx.vin[0].scriptSig)
      newscript = []
      for i in scriptSig:
          if len(newscript) == 0:
              assert len(i) == 0
              newscript.append(b'\x51')
          else:
              newscript.append(i)
      tx.vin[0].scriptSig = CScript(newscript)
      tx.rehash()
  
  
  class NULLDUMMYTest(TechcoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
          # This script tests NULLDUMMY activation, which is part of the 'segwit' deployment, so we go through
          # normal segwit activation here (and don't use the default always-on behaviour).
          self.extra_args = [[
              f'-segwitheight={COINBASE_MATURITY + 5}',
              '-addresstype=legacy',
              '-par=1',  # Use only one script thread to get the exact reject reason for testing
          ]]
  
      def skip_test_if_missing_module(self):
          self.skip_if_no_wallet()
  
      def run_test(self):
          self.nodes[0].createwallet(wallet_name='wmulti', disable_private_keys=True)
          wmulti = self.nodes[0].get_wallet_rpc('wmulti')
          w0 = self.nodes[0].get_wallet_rpc(self.default_wallet_name)
          self.address = w0.getnewaddress()
          self.pubkey = w0.getaddressinfo(self.address)['pubkey']
          self.ms_address = wmulti.addmultisigaddress(1, [self.pubkey])['address']
          self.wit_address = w0.getnewaddress(address_type='p2sh-segwit')
          self.wit_ms_address = wmulti.addmultisigaddress(1, [self.pubkey], '', 'p2sh-segwit')['address']
          if not self.options.descriptors:
              # Legacy wallets need to import these so that they are watched by the wallet. This is unnecessary (and does not need to be tested) for descriptor wallets
              wmulti.importaddress(self.ms_address)
              wmulti.importaddress(self.wit_ms_address)
  
          self.coinbase_blocks = self.nodes[0].generate(2)  # block height = 2
          coinbase_txid = []
          for i in self.coinbase_blocks:
              coinbase_txid.append(self.nodes[0].getblock(i)['tx'][0])
          self.nodes[0].generate(COINBASE_MATURITY)  # block height = COINBASE_MATURITY + 2
          self.lastblockhash = self.nodes[0].getbestblockhash()
          self.lastblockheight = COINBASE_MATURITY + 2
          self.lastblocktime = int(time.time()) + self.lastblockheight
  
          self.log.info(f"Test 1: NULLDUMMY compliant base transactions should be accepted to mempool and mined before activation [{COINBASE_MATURITY + 3}]")
          test1txs = [create_transaction(self.nodes[0], coinbase_txid[0], self.ms_address, amount=49)]
          txid1 = self.nodes[0].sendrawtransaction(test1txs[0].serialize_with_witness().hex(), 0)
          test1txs.append(create_transaction(self.nodes[0], txid1, self.ms_address, amount=48))
          txid2 = self.nodes[0].sendrawtransaction(test1txs[1].serialize_with_witness().hex(), 0)
          test1txs.append(create_transaction(self.nodes[0], coinbase_txid[1], self.wit_ms_address, amount=49))
          txid3 = self.nodes[0].sendrawtransaction(test1txs[2].serialize_with_witness().hex(), 0)
          self.block_submit(self.nodes[0], test1txs, accept=True)
  
          self.log.info("Test 2: Non-NULLDUMMY base multisig transaction should not be accepted to mempool before activation")
          test2tx = create_transaction(self.nodes[0], txid2, self.ms_address, amount=47)
          trueDummy(test2tx)
          assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test2tx.serialize_with_witness().hex(), 0)
  
          self.log.info(f"Test 3: Non-NULLDUMMY base transactions should be accepted in a block before activation [{COINBASE_MATURITY + 4}]")
          self.block_submit(self.nodes[0], [test2tx], accept=True)
  
          self.log.info("Test 4: Non-NULLDUMMY base multisig transaction is invalid after activation")
          test4tx = create_transaction(self.nodes[0], test2tx.hash, self.address, amount=46)
          test6txs = [CTransaction(test4tx)]
          trueDummy(test4tx)
          assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test4tx.serialize_with_witness().hex(), 0)
          self.block_submit(self.nodes[0], [test4tx], accept=False)
  
          self.log.info("Test 5: Non-NULLDUMMY P2WSH multisig transaction invalid after activation")
          test5tx = create_transaction(self.nodes[0], txid3, self.wit_address, amount=48)
          test6txs.append(CTransaction(test5tx))
          test5tx.wit.vtxinwit[0].scriptWitness.stack[0] = b'\x01'
          assert_raises_rpc_error(-26, NULLDUMMY_ERROR, self.nodes[0].sendrawtransaction, test5tx.serialize_with_witness().hex(), 0)
          self.block_submit(self.nodes[0], [test5tx], with_witness=True, accept=False)
  
          self.log.info(f"Test 6: NULLDUMMY compliant base/witness transactions should be accepted to mempool and in block after activation [{COINBASE_MATURITY + 5}]")
          for i in test6txs:
              self.nodes[0].sendrawtransaction(i.serialize_with_witness().hex(), 0)
          self.block_submit(self.nodes[0], test6txs, with_witness=True, accept=True)
  
      def block_submit(self, node, txs, *, with_witness=False, accept):
          tmpl = node.getblocktemplate(NORMAL_GBT_REQUEST_PARAMS)
          assert_equal(tmpl['previousblockhash'], self.lastblockhash)
          assert_equal(tmpl['height'], self.lastblockheight + 1)
          block = create_block(tmpl=tmpl, ntime=self.lastblocktime + 1)
          for tx in txs:
              tx.rehash()
              block.vtx.append(tx)
          block.hashMerkleRoot = block.calc_merkle_root()
          if with_witness:
              add_witness_commitment(block)
          block.rehash()
          block.solve()
          assert_equal(None if accept else NULLDUMMY_ERROR, node.submitblock(block.serialize().hex()))
          if accept:
              assert_equal(node.getbestblockhash(), block.hash)
              self.lastblockhash = block.hash
              self.lastblocktime += 1
              self.lastblockheight += 1
          else:
              assert_equal(node.getbestblockhash(), self.lastblockhash)
  
  
  if __name__ == '__main__':
      NULLDUMMYTest().main()
  