Merge pull request #7985 from BitGo/WIN-8740-add-dummy-witness

feat(sdk-coin-ada): add dummy witness for sponsored txn

Author: Ranjna-G

modules/sdk-coin-ada/src/lib/transactionBuilder.ts

@@ -455,6 +455,11 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
       if (this._type !== TransactionType.Send) {
         vkeyWitnesses.add(vkeyWitness);
       }
+      if (this._sponsorshipInfo) {
+        const sponsorPrv = CardanoWasm.PrivateKey.generate_ed25519();
+        const sponsorVkeyWitness = CardanoWasm.make_vkey_witness(txHash, sponsorPrv);
+        vkeyWitnesses.add(sponsorVkeyWitness);
+      }
     }
     witnessSet.set_vkeys(vkeyWitnesses);
 

modules/sdk-coin-ada/test/unit/tokenWithdrawal.ts

@@ -399,6 +399,8 @@ describe('ADA Token Operations', async () => {
     feeAddressChangeOutput.length.should.equal(1);
     // Fee address change should not have any tokens
     should.not.exist(feeAddressChangeOutput[0].multiAssets);
+
+    tx.getFee.should.equal('182485'); // Fee with two witnesses
   });
 
   describe('AdaToken verifyTransaction', () => {