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pytest: fix flake in test_coinmoves_unilateral_htlc_fulfill / test_coinmoves_unilateral_htlc_timeout

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DER sigs!  Normally, the commitment weight is:

```
Anchorspend for local commit tx fee 9751sat (w=722), commit_tx fee 4866sat (w=1284): package feerate 7286 perkw
Creating anchor spend for local commit tx 6a0816ca60d499edc70bfb786ebd164fb7a55d234c84d926102f5bd35087fd45: we're paying fee 9751sat
```

But if we're "lucky" the commitment tx is shorter:

```
Anchorspend for local commit tx fee 9744sat (w=722), commit_tx fee 4866sat (w=1283): package feerate 7286 perkw
Creating anchor spend for local commit tx acf78532a9448dd62a4e6319a3d2712189a88b6e59abc637260067d60df70782: we're paying fee 9744sat
```

The resulting failure:

```
2025-08-21T02:30:34.1906751Z >       assert moves == expected
...
...
2025-08-21T02:30:34.1965346Z E               {
2025-08-21T02:30:34.1965529Z E                   'account_id': 'wallet',
2025-08-21T02:30:34.1965767Z E                   'blockheight': 104,
2025-08-21T02:30:34.1965997Z E                   'created_index': 6,
2025-08-21T02:30:34.1966229Z E         -         'credit_msat': 15579000,
2025-08-21T02:30:34.1966467Z E         ?                           ^^
2025-08-21T02:30:34.1966698Z E         +         'credit_msat': 15586000,
2025-08-21T02:30:34.1966927Z E         ?                           ^^
2025-08-21T02:30:34.1967150Z E                   'debit_msat': 0,
2025-08-21T02:30:34.1967376Z E                   'extra_tags': [],
2025-08-21T02:30:34.1967599Z E         -         'output_msat': 15579000,
2025-08-21T02:30:34.1967832Z E         ?                           ^^
2025-08-21T02:30:34.1968061Z E         +         'output_msat': 15586000,
2025-08-21T02:30:34.1968294Z E         ?                           ^^
2025-08-21T02:30:34.1968540Z E                   'primary_tag': 'deposit',
2025-08-21T02:30:34.1968908Z E                   'utxo': 'acf78532a9448dd62a4e6319a3d2712189a88b6e59abc637260067d60df70782:0',
2025-08-21T02:30:34.1969366Z E               },
```

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2025-09-30 11:33:19 +09:30
parent f5fe10c4d5
commit 702a88de0c
1 changed files with 14 additions and 4 deletions
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18
tests/test_coinmoves.py
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@@ -727,6 +727,11 @@ def test_coinmoves_unilateral_htlc_timeout(node_factory, bitcoind):
line = l1.daemon.is_in_log('Tracking output.*/OUR_HTLC')
htlc = int(re.search(r'output [0-9a-f]{64}:([0-9]):', line).group(1))
# commitment tx weight can vary (DER sigs, FML) and so even though the feerate target
# is fixed, the amount of the child tx we create will vary, hence the change varies.
# So it's usually 15579000, but one in 128 it will be 15586000...
anchor_change_msats = bitcoind.rpc.gettxout(anchor_spend_txid, 0)['value'] * 100_000_000_000
expected_chain1 += [{'account_id': 'wallet', # Anchor spend from fundchannel change
'blockheight': 104,
'credit_msat': 0,
@@ -738,10 +743,10 @@ def test_coinmoves_unilateral_htlc_timeout(node_factory, bitcoind):
'utxo': f"{fundchannel['txid']}:{fundchannel['outnum'] ^ 1}"},
{'account_id': 'wallet', # change from anchor spend
'blockheight': 104,
'credit_msat': 15579000,
'credit_msat': anchor_change_msats,
'debit_msat': 0,
'extra_tags': [],
'output_msat': 15579000,
'output_msat': anchor_change_msats,
'primary_tag': 'deposit',
'utxo': f"{anchor_spend_txid}:0"},
{'account_id': fundchannel['channel_id'],
@@ -1221,6 +1226,11 @@ def test_coinmoves_unilateral_htlc_fulfill(node_factory, bitcoind):
line = l1.daemon.is_in_log('Tracking output.*/OUR_HTLC')
htlc = int(re.search(r'output [0-9a-f]{64}:([0-9]):', line).group(1))
# commitment tx weight can vary (DER sigs, FML) and so even though the feerate target
# is fixed, the amount of the child tx we create will vary, hence the change varies.
# So it's usually 15579000, but one in 128 it will be 15586000...
anchor_change_msats = bitcoind.rpc.gettxout(anchor_spend_txid, 0)['value'] * 100_000_000_000
expected_chain1 += [{'account_id': 'wallet', # Anchor spend from fundchannel change
'blockheight': 104,
'credit_msat': 0,
@@ -1232,10 +1242,10 @@ def test_coinmoves_unilateral_htlc_fulfill(node_factory, bitcoind):
'utxo': f"{fundchannel['txid']}:{fundchannel['outnum'] ^ 1}"},
{'account_id': 'wallet', # Change from anchor spend
'blockheight': 104,
'credit_msat': 15579000,
'credit_msat': anchor_change_msats,
'debit_msat': 0,
'extra_tags': [],
'output_msat': 15579000,
'output_msat': anchor_change_msats,
'primary_tag': 'deposit',
'utxo': f"{anchor_spend_txid}:0"},
{'account_id': fundchannel['channel_id'],