assert!(maybe_add_change_output(&mut tx, 9, 0, 250, output_spk.clone()).is_err());
assert_eq!(tx.wtxid(), orig_wtxid); // Failure doesn't change the transaction
// but 10-564 is, just not enough to add a change output...
assert!(maybe_add_change_output(&mut tx, 9, 0, 250, output_spk.clone()).is_err());
assert_eq!(tx.wtxid(), orig_wtxid); // Failure doesn't change the transaction
// but 10-564 is, just not enough to add a change output...