feat(abstract-utxo): test signPsbtWithMusig2Participant

Replace signAndVerifyPsbt test with signPsbtWithMusig2Participant test
to verify that this function works with a mock Musig2Participant.

Issue: BTC-2806

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

modules/abstract-utxo/test/unit/transaction/fixedScript/signPsbt.ts

@@ -2,22 +2,27 @@ import assert from 'node:assert/strict';
 
 import * as utxolib from '@bitgo/utxo-lib';
 
-import { signAndVerifyPsbt } from '../../../../src/transaction/fixedScript/signPsbt';
+import { Musig2Participant, signPsbtWithMusig2Participant } from '../../../../src/transaction/fixedScript/signPsbt';
 
-function describeSignAndVerifyPsbt(acidTest: utxolib.testutil.AcidTest) {
+function describeSignPsbtWithMusig2Participant(acidTest: utxolib.testutil.AcidTest) {
   describe(`${acidTest.name}`, function () {
-    it('should sign unsigned psbt to halfsigned', function () {
+    it('should sign unsigned psbt to halfsigned', async function () {
       // Create unsigned PSBT
       const psbt = acidTest.createPsbt();
 
-      // Set musig2 nonces for taproot inputs before signing
-      const sessionId = Buffer.alloc(32);
-      psbt.setAllInputsMusig2NonceHD(acidTest.rootWalletKeys.user, { sessionId });
-      psbt.setAllInputsMusig2NonceHD(acidTest.rootWalletKeys.bitgo, { deterministic: true });
+      // Create mock Musig2Participant that sets BitGo nonces
+      const mockCoin: Musig2Participant = {
+        async getMusig2Nonces(psbt: utxolib.bitgo.UtxoPsbt, walletId: string): Promise<utxolib.bitgo.UtxoPsbt> {
+          psbt.setAllInputsMusig2NonceHD(acidTest.rootWalletKeys.bitgo, { deterministic: true });
+          return psbt;
+        },
+      };
 
-      // Sign with user key
-      const result = signAndVerifyPsbt(psbt, acidTest.rootWalletKeys.user, {
+      // Sign with user key through signPsbtWithMusig2Participant
+      const result = await signPsbtWithMusig2Participant(mockCoin, psbt, acidTest.rootWalletKeys.user, {
         isLastSignature: false,
+        signingStep: undefined,
+        walletId: 'test-wallet-id',
       });
 
       // Result should be a PSBT (not finalized)
@@ -40,13 +45,13 @@ function describeSignAndVerifyPsbt(acidTest: utxolib.testutil.AcidTest) {
   });
 }
 
-describe('signAndVerifyPsbt', function () {
+describe('signPsbtWithMusig2Participant', function () {
   // Create test suite with includeP2trMusig2ScriptPath set to false
   // p2trMusig2 script path inputs are signed by user and backup keys,
   // which is not the typical signing pattern and makes testing more complex
   utxolib.testutil.AcidTest.suite({ includeP2trMusig2ScriptPath: false })
     .filter((test) => test.signStage === 'unsigned')
     .forEach((test) => {
-      describeSignAndVerifyPsbt(test);
+      describeSignPsbtWithMusig2Participant(test);
     });
 });