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pytest: test that we indeed do MPP even if not advertized.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2025-02-14 21:00:43 +10:30
parent d881c3cf3e
commit 4bb7b49f0a
1 changed files with 27 additions and 0 deletions
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27
tests/test_xpay.py
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@@ -649,3 +649,30 @@ def test_xpay_no_mpp(node_factory, chainparams):
assert ret['successful_parts'] == 1
assert ret['amount_msat'] == AMOUNT
assert ret['amount_sent_msat'] == AMOUNT + AMOUNT // 100000 + 1
def test_xpay_bolt12_no_mpp(node_factory, chainparams):
"""We should not (yet!) avoid mpp if BOLT12 invoice doesn't say we should"""
l1, l2, l3, l4 = node_factory.get_nodes(4, opts=[{}, {}, {'dev-force-features': -17}, {}])
node_factory.join_nodes([l1, l2, l3], wait_for_announce=True)
node_factory.join_nodes([l1, l4, l3], wait_for_announce=True)
# Amount needs to be enought that it bothers splitting, but not
# so much that it can't pay without mpp.
AMOUNT = 500000000
# l2 will advertize mpp, l3 won't.
l2offer = l2.rpc.offer(AMOUNT, 'test_xpay_bolt12_no_mpp')
invl2 = l1.rpc.fetchinvoice(l2offer['bolt12'])
l3offer = l3.rpc.offer(AMOUNT, 'test_xpay_bolt12_no_mpp')
invl3 = l1.rpc.fetchinvoice(l3offer['bolt12'])
assert l1.rpc.decode(invl2['invoice'])['invoice_features'] == "020000"
assert l1.rpc.decode(invl3['invoice'])['invoice_features'] == ""
# This will MPP ANYWAY, even though MPP is not specified!
ret = l1.rpc.xpay(invl3['invoice'])
assert ret['failed_parts'] == 0
assert ret['successful_parts'] == 2
assert ret['amount_msat'] == AMOUNT
assert ret['amount_sent_msat'] == AMOUNT + AMOUNT // 100000 + 1