test: add normalizeToV1 coverage and fix unused import

- Remove unused LedgerTransactionExpanded import (fixes TS6133 build error)
- Add test for v2 wrapped -> v1 flat normalization via hashLedger
- Add test verifying hashTxTree matches expected transaction_hash
- Validates the core v2-to-v1 conversion logic end-to-end
- Addresses pdp2121 inline review request on normalizeToV1

Author: slurpyone

packages/xrpl/src/utils/hashes/hashLedger.ts

@@ -12,7 +12,6 @@ import { APIVersion } from '../../models'
 import { LedgerEntry } from '../../models/ledger'
 import {
   LedgerVersionMap,
-  LedgerTransactionExpanded,
   LedgerTransactionExpandedV1,
   LedgerTransactionExpandedV2,
 } from '../../models/ledger/Ledger'

packages/xrpl/test/utils/hashLedger.test.ts

@@ -5,7 +5,7 @@ import { hashes } from '../../src/utils'
 import requests from '../fixtures/requests'
 import responses from '../fixtures/responses'
 
-const { hashLedger } = hashes
+const { hashLedger, hashTxTree } = hashes
 const { hashLedger: REQUEST_FIXTURES } = requests
 
 describe('hashLedger', function () {
@@ -150,4 +150,49 @@ describe('hashLedger', function () {
       'transactionHash in header does not match computed hash of transactions',
     )
   })
+
+  it('hashLedger - normalizes v2 wrapped transactions to v1 for hashing', function () {
+    // Convert the v1 flat transactions to v2 wrapped format, then verify
+    // hashLedger still computes the correct transaction_hash by normalizing
+    // them back to v1 internally.
+    const v1Ledger = JSON.parse(JSON.stringify(ledger))
+    v1Ledger.parent_close_time = v1Ledger.close_time
+
+    // Wrap each v1 flat tx into v2 format: { tx_json, meta, hash, ... }
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any -- test conversion
+    const v2Transactions = v1Ledger.transactions.map((tx: any) => {
+      const { hash, metaData, ledger_index: _li, ...txFields } = tx
+      return {
+        tx_json: txFields,
+        meta: metaData,
+        hash,
+        validated: true,
+        ledger_index: v1Ledger.ledger_index,
+        close_time_iso: '2013-Jan-02 03:21:10.000000000 UTC',
+        ledger_hash: v1Ledger.ledger_hash,
+      }
+    })
+
+    const v2Ledger = {
+      ...v1Ledger,
+      transactions: v2Transactions,
+    }
+
+    // Should produce the same hash because normalizeToV1 converts v2 back
+    const hash = hashLedger(v2Ledger, { computeTreeHashes: true })
+    assert.strictEqual(
+      hash,
+      hashLedger(v1Ledger, { computeTreeHashes: true }),
+    )
+  })
+
+  it('hashLedger - hashTxTree matches expected transaction_hash', function () {
+    // Direct test of hashTxTree against the known transaction_hash from fixtures
+    const v1Ledger = JSON.parse(JSON.stringify(ledger))
+
+    assert.strictEqual(
+      hashTxTree(v1Ledger.transactions),
+      v1Ledger.transaction_hash,
+    )
+  })
 })