test(utxo-lib): add check in utxo-lib for op-return

TICKET: BTC-1582

modules/utxo-lib/src/testutil/psbt.ts

@@ -49,10 +49,11 @@ export type Input = {
 /**
  * Set isInternalAddress=true for internal output address
  */
+// Make script: string as instead of scriptType or address
 export type Output = {
   value: bigint;
   isInternalAddress?: boolean;
-} & ({ scriptType: OutputScriptType } | { address: string });
+} & ({ scriptType: OutputScriptType } | { address: string } | { script: string });
 
 /**
  * array of supported input script types.
@@ -207,9 +208,12 @@ export function constructPsbt(
         i,
         output.value
       );
-    } else if (output.address) {
+    } else if ('address' in output) {
       const { address, value } = output;
       psbt.addOutput({ script: toOutputScript(address, network), value });
+    } else if ('script' in output) {
+      const { script, value } = output;
+      psbt.addOutput({ script: Buffer.from(script, 'hex'), value });
     }
   });
 

modules/utxo-lib/test/bitgo/psbt/PsbtOutputs.ts

@@ -239,5 +239,31 @@ describe('psbt internal and wallet outputs', function () {
         (e: any) => e.message === 'Input Bip32Derivation can not be found'
       );
     });
+
+    it('PSBT woth an OP_RETURN output', function () {
+      const opReturnScript =
+        '6a4c505341542b01045bde60b7d0e6b758ca5dd8c61d377a2c5f1af51ec1a9e209f5ea0036c8c2f41078a3cebee57d8a47d501041f5e0e66b17576a914c4b8ae927ff2b9ce218e20bf06d425d6b68424fd88ac';
+      const psbt = testutil.constructPsbt(
+        [{ scriptType: 'p2wsh', value: BigInt(value) }],
+        [
+          {
+            address: externalAddress,
+            value: BigInt(value - fee),
+          },
+          {
+            script: opReturnScript,
+            value: BigInt(0),
+          },
+        ],
+        network,
+        rootWalletKeys,
+        'unsigned'
+      );
+      const tx = psbt.getUnsignedTx();
+      assert.strictEqual(tx.outs.length, 2);
+      const out = tx.outs[1];
+      assert.strictEqual(out.value, BigInt(0));
+      assert.strictEqual(out.script.toString('hex'), opReturnScript);
+    });
   });
 });