Add unit test locking in tx getter defensive-copy immutability

[Copilot]

The tx getter on TransactionBase was updated to return a defensive copy (via fromXDR(toXDR())), but no test explicitly verified that mutating the returned object leaves the internal XDR untouched.

Changes

• New test in test/unit/transaction_test.js: asserts that calling .fee(...) on the object returned by transaction.tx does not alter transaction._tx

it('tx getter returns a defensive copy that does not affect internal XDR', function () {
  const transaction = this.transaction;
  const txCopy = transaction.tx;
  txCopy.fee(StellarBase.xdr.Int64.fromString('999'));

  expect(transaction.tx.fee().toString()).to.equal('100');
});

This closes the gap where the existing tests only verified toEnvelope() isolation, leaving the tx getter's copy semantics untested.

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[github-actions]

Size Change: 0 B

Total Size: 3.53 MB

ℹ️ View Unchanged

Filename	Size
dist/stellar-base.js	2.6 MB
dist/stellar-base.min.js	921 kB

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