test: verify TX hashes match expected values (#333)

Signed-off-by: Aurora Gaffney <[email protected]>

Author: agaffney

internal/handshake/transaction_test.go

@@ -0,0 +1,43 @@
+// Copyright 2025 Blink Labs Software
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file or at
+// https://opensource.org/licenses/MIT.
+
+package handshake_test
+
+import (
+	"bytes"
+	"encoding/hex"
+	"testing"
+
+	"github.com/blinklabs-io/cdnsd/internal/handshake"
+)
+
+func TestTransactionHash(t *testing.T) {
+	// From TX 1881afbe757f9d433144edf49e29c7f6bbfdbc1941d06792dc5ee13020d63570 on mainnet
+	testTxBytes := decodeHex("00000000010000000000000000000000000000000000000000000000000000000000000000ffffffff3b2cf8140134369b3b00000000001498c8297a67eb81ec36253828b5621a601ba2328a0000a62204000306566961425443087c524fd539e1eab8080000000000000000")
+	expectedHash := "1881afbe757f9d433144edf49e29c7f6bbfdbc1941d06792dc5ee13020d63570"
+	expectedWitnessHash := "d36b1e9861dd504629b053d14d9801b295667a4c7002c9d2836be502bfdb3b3a"
+	br := bytes.NewReader(testTxBytes)
+	tmpTx, err := handshake.NewTransactionFromReader(br)
+	if err != nil {
+		t.Fatalf("unexpected error decoding transaction: %s", err)
+	}
+	tmpTxHash := hex.EncodeToString(tmpTx.Hash())
+	if tmpTxHash != expectedHash {
+		t.Fatalf(
+			"did not get expected TX hash: got %s, wanted %s",
+			tmpTxHash,
+			expectedHash,
+		)
+	}
+	tmpTxWitnessHash := hex.EncodeToString(tmpTx.WitnessHash())
+	if tmpTxWitnessHash != expectedWitnessHash {
+		t.Fatalf(
+			"did not get expected TX witness hash: got %s, wanted %s",
+			tmpTxWitnessHash,
+			expectedWitnessHash,
+		)
+	}
+}