// Route an HTLC and set the signer as unavailable.
let (_, _, chan_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 1);
route_payment(&nodes[0], &[&nodes[1]], 1_000_000);
// Route an HTLC and set the signer as unavailable.
let (_, _, chan_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 1);
route_payment(&nodes[0], &[&nodes[1]], 1_000_000);