fixup! splice: prevent splice going to onchaind & race prevention

Add a regression check for Issue ElementsProject#6533

Author: ddustin

tests/test_splicing.py

@@ -2,6 +2,7 @@
 from utils import TEST_NETWORK
 import pytest
 import unittest
+import time
 
 
 @pytest.mark.openchannel('v1')
@@ -34,3 +35,7 @@ def test_splice(node_factory, bitcoind):
 
     inv = l2.rpc.invoice(10**2, '3', 'no_3')
     l1.rpc.pay(inv['bolt11'])
+
+    # Check that the splice doesn't generate a unilateral close transaction
+    time.sleep(5)
+    assert l1.db_query("SELECT count(*) as c FROM channeltxs;")[0]['c'] == 0