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test: MiniWallet: Default fee_rate in send_self_transfer, Pass in utxo_to_spend

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Adds two new features to MiniWallet:

* The fee rate is irrelevant sometimes, so just set an arbitrary default
* The utxo to spend needs to be selected manually sometimes
This commit is contained in:
MarcoFalke 2020-09-09 10:37:39 +02:00
parent fa65a11d0c
commit faba790bd4
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1 changed files with 5 additions and 5 deletions
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10
test/functional/test_framework/wallet.py
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@ -40,17 +40,17 @@ class MiniWallet:
self._utxos.append({'txid': cb_tx['txid'], 'vout': 0, 'value': cb_tx['vout'][0]['value']})
return blocks
def send_self_transfer(self, *, fee_rate, from_node):
def send_self_transfer(self, *, fee_rate=Decimal("0.003"), from_node, utxo_to_spend=None):
"""Create and send a tx with the specified fee_rate. Fee may be exact or at most one satoshi higher than needed."""
self._utxos = sorted(self._utxos, key=lambda k: k['value'])
largest_utxo = self._utxos.pop() # Pick the largest utxo and hope it covers the fee
utxo_to_spend = utxo_to_spend or self._utxos.pop() # Pick the largest utxo (if none provided) and hope it covers the fee
vsize = Decimal(96)
send_value = satoshi_round(largest_utxo['value'] - fee_rate * (vsize / 1000))
fee = largest_utxo['value'] - send_value
send_value = satoshi_round(utxo_to_spend['value'] - fee_rate * (vsize / 1000))
fee = utxo_to_spend['value'] - send_value
assert send_value > 0
tx = CTransaction()
tx.vin = [CTxIn(COutPoint(int(largest_utxo['txid'], 16), largest_utxo['vout']))]
tx.vin = [CTxIn(COutPoint(int(utxo_to_spend['txid'], 16), utxo_to_spend['vout']))]
tx.vout = [CTxOut(int(send_value * COIN), self._scriptPubKey)]
tx.wit.vtxinwit = [CTxInWitness()]
tx.wit.vtxinwit[0].scriptWitness.stack = [CScript([OP_TRUE])]