test: regression for #402 — RawPlutusData inline datum CBOR round-trip#493
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…CBOR round-trip Adds test_sign_dex_transaction_with_raw_plutus_data_inline_datum using the Liqwid DEX fixture (Conway era, two outputs with complex inline Plutus datums). Asserts full CBOR round-trip, stable tx.id, and that a signature over the body hash verifies correctly — the exact sequence that broke before fixes Python-Cardano#474 and Python-Cardano#479. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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What this does
Adds a regression test that guards against issue #402: unsigned DEX transactions exported by wallets (e.g. Eternl) were getting corrupted when PyCardano decoded and re-encoded them.
Why it matters
These transactions contain outputs with inline Plutus datums encoded as indefinite-length CBOR. Before the fixes in #474 and #479, decoding and re-serializing such a transaction changed the body bytes. Since a transaction's id is the blake2b hash of those bytes, the id changed too — which made any externally-computed signature invalid and caused nodes to reject the transaction.
This test makes sure that bug can't quietly come back.
What the test checks
Using a real Liqwid DEX transaction (Conway era, two outputs with complex inline datums) as a fixture, it verifies:
from_cbor()→to_cbor_hex()returns the original bytes.nacl).Scope
Test-only change — one new test in
test/pycardano/test_transaction.py. No library code is touched.