message: test: add `bad-txns-prevout-null` test to mempool_accept.py
diff: @@ -13,6 +13,7 @@ from test_framework.messages import (
  BIP125_SEQUENCE_NUMBER,
  COIN,
  COutPoint,
  + CTxIn,
  CTxOut,
  MAX_BLOCK_BASE_SIZE,
  MAX_MONEY,
  @@ -247,6 +248,14 @@ class MempoolAcceptanceTest(BitcoinTestFramework):
  rawtxs=[tx.serialize().hex()],
  )
  + self.log.info('A non-coinbase transaction with coinbase-like outpoint')
  + tx = tx_from_hex(raw_tx_reference)
  + tx.vin.append(CTxIn(COutPoint(hash=0, n=0xffffffff)))
  + self.check_mempool_result(
  + result_expected=[{'txid': tx.rehash(), 'allowed': False, 'reject-reason': 'bad-txns-prevout-null'}],
  + rawtxs=[tx.serialize().hex()],
  + )
  +
  self.log.info('A coinbase transaction')
  # Pick the input of the first tx we signed, so it has to be a coinbase tx
  raw_tx_coinbase_spent = node.getrawtransaction(txid=node.decoderawtransaction(hexstring=raw_tx_in_block)['vin'][0]['txid'])
  