[#1545] morph/event: Simplify frostfs contract event parsing

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/morph/event/frostfs/withdraw_test.go

@@ -4,7 +4,6 @@ import (
 	"math/big"
 	"testing"
 
-	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/morph/event"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 	"github.com/stretchr/testify/require"
@@ -12,7 +11,7 @@ import (
 
 func TestParseWithdraw(t *testing.T) {
 	var (
-		id   = []byte("Hello World")
+		id   = util.Uint256{1, 2, 3}
 		user = util.Uint160{0x1, 0x2, 0x3}
 
 		amount int64 = 10
@@ -25,7 +24,7 @@ func TestParseWithdraw(t *testing.T) {
 		}
 
 		_, err := ParseWithdraw(createNotifyEventFromItems(prms))
-		require.EqualError(t, err, event.WrongNumberOfParameters(3, len(prms)).Error())
+		require.Error(t, err)
 	})
 
 	t.Run("wrong user parameter", func(t *testing.T) {
@@ -59,12 +58,12 @@ func TestParseWithdraw(t *testing.T) {
 		ev, err := ParseWithdraw(createNotifyEventFromItems([]stackitem.Item{
 			stackitem.NewByteArray(user.BytesBE()),
 			stackitem.NewBigInteger(new(big.Int).SetInt64(amount)),
-			stackitem.NewByteArray(id),
+			stackitem.NewByteArray(id[:]),
 		}))
 
 		require.NoError(t, err)
 		require.Equal(t, Withdraw{
-			IDValue:     id,
+			IDValue:     id[:],
 			AmountValue: amount,
 			UserValue:   user,
 		}, ev)