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pytest: fix test_multifunding_feerates

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There's a 1 in 256 chance that our signature on the transaction is 70,
not 71 bytes long.  This changes the freerate.  So fix up the weight in
this case, to be the expected weight.

```
@unittest.skipIf(TEST_NETWORK == 'liquid-regtest', "Fees on elements are different")
@pytest.mark.developer("uses dev-fail")
@pytest.mark.openchannel('v1')  # v2 the weight calculation is off by 3
deftest_multifunding_feerates(node_factory, bitcoind):
'''
    Test feerate parameters for multifundchannel
    '''
        funding_tx_feerate = '10000perkw'
        commitment_tx_feerate_int = 2000
        commitment_tx_feerate = str(commitment_tx_feerate_int) + 'perkw'
        l1, l2, l3 = node_factory.get_nodes(3, opts={'log-level': 'debug'})
        l1.fundwallet(1 << 26)
def_connect_str(node):
return'{}@localhost:{}'.format(node.info['id'], node.port)
        destinations = [{"id": _connect_str(l2), 'amount': 50000}]
        res = l1.rpc.multifundchannel(destinations, feerate=funding_tx_feerate,
                                      commitment_feerate=commitment_tx_feerate)
        entry = bitcoind.rpc.getmempoolentry(res['txid'])
        weight = entry['weight']
        expected_fee = int(funding_tx_feerate[:-5]) * weight // 1000
>       assert expected_fee == entry['fees']['base'] * 10 ** 8
E       AssertionError: assert 7000 == (Decimal('0.00007010') * (10 ** 8))
tests/test_connection.py:1982: AssertionError
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2022-06-26 14:26:01 +09:30
parent 25699994e5
commit 9152b8c424
1 changed files with 3 additions and 0 deletions
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3
tests/test_connection.py
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@ -1978,6 +1978,9 @@ def test_multifunding_feerates(node_factory, bitcoind):
entry = bitcoind.rpc.getmempoolentry(res['txid'])
weight = entry['weight']
# If signature is unexpectedly short, we get a spurious failure here!
res = bitcoind.rpc.decoderawtransaction(res['tx'])
weight += 71 - len(res['vin'][0]['txinwitness'][0]) // 2
expected_fee = int(funding_tx_feerate[:-5]) * weight // 1000
assert expected_fee == entry['fees']['base'] * 10 ** 8