isAlive() is deprecated, use is_alive() instead
@ -779,7 +779,7 @@ def test_onchain_middleman(node_factory, bitcoind):
print("Got err from sendpay thread")
raise err
t.join(timeout=1)
assert not t.isAlive()
assert not t.is_alive()
# Three more, l2 can spend to-us.
bitcoind.generate_block(3)