test(utxo-coredao): add fixtures from testnet3

TICKET: BTC-1578

Author: davidkaplanbitgo

modules/utxo-coredao/src/opReturn.ts

@@ -194,3 +194,15 @@ export function parseCoreDaoOpReturnOutputScript(script: Buffer): OpReturnParams
     return { ...baseParams, redeemScript: Buffer.from(dataBuffer.subarray(offset)) };
   }
 }
+
+export function toString(params: OpReturnParams): string {
+  return JSON.stringify({
+    version: params.version,
+    chainId: params.chainId.toString('hex'),
+    delegator: params.delegator.toString('hex'),
+    validator: params.validator.toString('hex'),
+    fee: params.fee,
+    ...('redeemScript' in params ? { redeemScript: params.redeemScript.toString('hex') } : {}),
+    ...('timelock' in params ? { timelock: params.timelock } : {}),
+  });
+}

modules/utxo-coredao/test/fixtures/opReturn/66ed4cea26a410248a6d87f14b2bca514f33920c54d4af63ed46a903793115d5.json

@@ -0,0 +1,8 @@
+{
+  "version": 1,
+  "chainId": "045b",
+  "delegator": "2dda5d5d3bec673033b5f21ca07c77695404f491",
+  "validator": "2953559db5cc88ab20b1960faa9793803d070337",
+  "fee": 0,
+  "timelock": 1725503428
+}

modules/utxo-coredao/test/fixtures/opReturn/66ed4cea26a410248a6d87f14b2bca514f33920c54d4af63ed46a903793115d5.txt

@@ -0,0 +1 @@
+6a345341542b01045b2dda5d5d3bec673033b5f21ca07c77695404f4912953559db5cc88ab20b1960faa9793803d07033700c417d966

modules/utxo-coredao/test/unit/opReturn.ts

@@ -6,8 +6,10 @@ import {
   decodeTimelock,
   encodeTimelock,
   parseCoreDaoOpReturnOutputScript,
+  toString,
 } from '../../src';
 import { testutil } from '@bitgo/utxo-lib';
+import { getFixture } from './utils';
 
 describe('OP_RETURN', function () {
   const validVersion = 2;
@@ -246,6 +248,16 @@ describe('OP_RETURN', function () {
       assert.deepStrictEqual(parsed.redeemScript, validRedeemScript);
     });
 
+    it('should parse valid opreturn script from testnet', async function () {
+      // Source: https://mempool.space/testnet/tx/66ed4cea26a410248a6d87f14b2bca514f33920c54d4af63ed46a903793115d5
+      const baseFixturePath = 'test/fixtures/opReturn/66ed4cea26a410248a6d87f14b2bca514f33920c54d4af63ed46a903793115d5';
+      const opReturnHex = await getFixture(baseFixturePath + '.txt', undefined);
+      assert(typeof opReturnHex === 'string');
+      const parsed = parseCoreDaoOpReturnOutputScript(Buffer.from(opReturnHex, 'hex'));
+      const parsedFixture = await getFixture(baseFixturePath + '.json', JSON.parse(toString(parsed)));
+      assert.deepStrictEqual(toString(parsed), JSON.stringify(parsedFixture));
+    });
+
     it('should fail if there is an invalid op-return', function () {
       const script = defaultScript.replace('6a4c50', '6b4c50');
       assert.throws(() => parseCoreDaoOpReturnOutputScript(Buffer.from(script, 'hex')));