test(babbage): block CBOR round-trip

Signed-off-by: Chris Gianelloni <wolf31o2@blinklabs.io>

Author: wolf31o2

ledger/babbage/babbage.go

@@ -456,6 +456,12 @@ func (o *BabbageTransactionOutput) UnmarshalCBOR(cborData []byte) error {
 		// Copy from temp legacy object to Babbage format
 		o.OutputAddress = tmpOutput.OutputAddress
 		o.OutputAmount = tmpOutput.OutputAmount
+		// Copy datum hash if present in legacy Alonzo output
+		if tmpOutput.OutputDatumHash != nil {
+			o.DatumOption = &BabbageTransactionOutputDatumOption{
+				hash: tmpOutput.OutputDatumHash,
+			}
+		}
 		o.legacyOutput = true
 	} else {
 		type tBabbageTransactionOutput BabbageTransactionOutput
@@ -476,6 +482,10 @@ func (o *BabbageTransactionOutput) MarshalCBOR() ([]byte, error) {
 			OutputAddress: o.OutputAddress,
 			OutputAmount:  o.OutputAmount,
 		}
+		// Copy datum hash if present
+		if o.DatumOption != nil && o.DatumOption.hash != nil {
+			tmpOutput.OutputDatumHash = o.DatumOption.hash
+		}
 		return cbor.Encode(&tmpOutput)
 	}
 	return cbor.EncodeGeneric(o)