pytest: add a sanity check for the listtransactions command

Signed-off-by: Antoine Poinsot <darosior@protonmail.com>

tests/test_misc.py

@@ -2388,3 +2388,16 @@ def test_commitfee_option(node_factory):
     l2_commit_fees = l2.rpc.call("estimatefees")["unilateral_close"]
 
     assert l1_commit_fees == 2 * l2_commit_fees == 2 * 4 * mock_wu  # WU->VB
+
+
+@pytest.mark.xfail(strict=True)
+def test_listtransactions(node_factory):
+    """Sanity check for the listtransactions RPC command"""
+    l1, l2 = node_factory.get_nodes(2, opts=[{}, {}])
+
+    wallettxid = l1.openchannel(l2, 10**4)["wallettxid"]
+    txids = [i["txid"] for tx in l1.rpc.listtransactions()["transactions"]
+             for i in tx["inputs"]]
+    # The txid of the transaction funding the channel is present, and
+    # represented as little endian (like bitcoind and explorers).
+    assert wallettxid in txids