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62 lines
2.5 KiB
62 lines
2.5 KiB
#!/usr/bin/env python3
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# Copyright (c) 2014-2020 The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test spending coinbase transactions.
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The coinbase transaction in block N can appear in block
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N+100... so is valid in the mempool when the best block
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height is N+99.
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This test makes sure coinbase spends that will be mature
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in the next block are accepted into the memory pool,
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but less mature coinbase spends are NOT.
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"""
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal, assert_raises_rpc_error
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from test_framework.wallet import MiniWallet
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class MempoolSpendCoinbaseTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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def run_test(self):
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wallet = MiniWallet(self.nodes[0])
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# Invalidate two blocks, so that miniwallet has access to a coin that will mature in the next block
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chain_height = 198
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self.nodes[0].invalidateblock(self.nodes[0].getblockhash(chain_height + 1))
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assert_equal(chain_height, self.nodes[0].getblockcount())
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# Coinbase at height chain_height-100+1 ok in mempool, should
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# get mined. Coinbase at height chain_height-100+2 is
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# too immature to spend.
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wallet.scan_blocks(start=chain_height - 100 + 1, num=1)
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utxo_mature = wallet.get_utxo()
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wallet.scan_blocks(start=chain_height - 100 + 2, num=1)
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utxo_immature = wallet.get_utxo()
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spend_mature_id = wallet.send_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_mature)["txid"]
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# other coinbase should be too immature to spend
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immature_tx = wallet.create_self_transfer(from_node=self.nodes[0], utxo_to_spend=utxo_immature, mempool_valid=False)
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assert_raises_rpc_error(-26,
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"bad-txns-premature-spend-of-coinbase",
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lambda: self.nodes[0].sendrawtransaction(immature_tx['hex']))
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# mempool should have just the mature one
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assert_equal(self.nodes[0].getrawmempool(), [spend_mature_id])
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# mine a block, mature one should get confirmed
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self.nodes[0].generate(1)
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assert_equal(set(self.nodes[0].getrawmempool()), set())
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# ... and now previously immature can be spent:
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spend_new_id = self.nodes[0].sendrawtransaction(immature_tx['hex'])
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assert_equal(self.nodes[0].getrawmempool(), [spend_new_id])
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if __name__ == '__main__':
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MempoolSpendCoinbaseTest().main()
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