test: add test_bump_fee_no_change_add_input_and_change()

Author: luisschwab

wallet/tests/wallet.rs

@@ -2620,6 +2620,60 @@ fn test_bump_fee_absolute_add_input() {
     assert_eq!(fee.unwrap_or(Amount::ZERO), Amount::from_sat(6_000));
 }
 
+#[test]
+fn test_legacy_bump_fee_absolute_add_input() {
+    let (mut wallet, _) = get_funded_wallet(get_test_pkh(), None);
+    receive_output_in_latest_block(&mut wallet, 25_000);
+    let addr = Address::from_str("2N1Ffz3WaNzbeLFBb51xyFMHYSEUXcbiSoX")
+        .unwrap()
+        .assume_checked();
+    let mut builder = wallet.build_tx().coin_selection(LargestFirstCoinSelection);
+    builder.add_recipient(addr.script_pubkey(), Amount::from_sat(45_000));
+    let psbt = builder.finish().unwrap();
+    let tx = psbt.extract_tx().expect("failed to extract tx");
+    let original_sent_received = wallet.sent_and_received(&tx);
+    let txid = tx.compute_txid();
+    insert_tx(&mut wallet, tx);
+
+    let mut builder = wallet.build_fee_bump(txid).unwrap();
+    builder.fee_absolute(Amount::from_sat(6_000));
+    let psbt = builder.finish().unwrap();
+    let sent_received =
+        wallet.sent_and_received(&psbt.clone().extract_tx().expect("failed to extract tx"));
+    let fee = check_fee!(wallet, psbt);
+
+    assert_eq!(
+        sent_received.0,
+        original_sent_received.0 + Amount::from_sat(25_000)
+    );
+    assert_eq!(
+        fee.unwrap_or(Amount::ZERO) + sent_received.1,
+        Amount::from_sat(30_000)
+    );
+
+    let tx = &psbt.unsigned_tx;
+    assert_eq!(tx.input.len(), 2);
+    assert_eq!(tx.output.len(), 2);
+    assert_eq!(
+        tx.output
+            .iter()
+            .find(|txout| txout.script_pubkey == addr.script_pubkey())
+            .unwrap()
+            .value,
+        Amount::from_sat(45_000)
+    );
+    assert_eq!(
+        tx.output
+            .iter()
+            .find(|txout| txout.script_pubkey != addr.script_pubkey())
+            .unwrap()
+            .value,
+        sent_received.1
+    );
+
+    assert_eq!(fee.unwrap_or(Amount::ZERO), Amount::from_sat(6_000));
+}
+
 #[test]
 fn test_bump_fee_no_change_add_input_and_change() {
     let (mut wallet, _) = get_funded_wallet_wpkh();