Add codec functions

common/l2tx_test.go

@@ -1,10 +1,12 @@
 package common
 
 import (
+	"encoding/hex"
 	"math/big"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestNewL2Tx(t *testing.T) {
@@ -18,3 +20,23 @@ func TestNewL2Tx(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, "0x020000000156660000000090", l2Tx.TxID.String())
 }
+
+func TestL2TxByteParsers(t *testing.T) {
+	amount := new(big.Int)
+	amount.SetString("79000000", 10)
+	l2Tx := &L2Tx{
+		ToIdx:   256,
+		Amount:  amount,
+		FromIdx: 257,
+		Fee:     201,
+	}
+	// Data from the compatibility test
+	expected := "00000101000001002b16c9"
+	encodedData, err := l2Tx.Bytes(32)
+	require.Nil(t, err)
+	assert.Equal(t, expected, hex.EncodeToString(encodedData))
+
+	decodedData, err := L2TxFromBytes(encodedData, 32)
+	require.Nil(t, err)
+	assert.Equal(t, l2Tx, decodedData)
+}