You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: torrentfile_test.go
    path of file: ./repos/torrent-client/torrentfile
    
    the code of the file until where you have to start completion: package torrentfile

import (
	"encoding/json"
	"flag"
	"io/ioutil"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

var update = flag.Bool("update", false, "update .golden.json files")

func TestOpen(t *testing.T) {
	torrent, err := Open("testdata/archlinux-2019.12.01-x86_64.iso.torrent")
	require.Nil(t, err)

	goldenPath := "testdata/archlinux-2019.12.01-x86_64.iso.torrent.golden.json"
	if *update {
		serialized, err := json.MarshalIndent(torrent, "", "  ")
		require.Nil(t, err)
		ioutil.WriteFile(goldenPath, serialized, 0644)
	}

	expected := TorrentFile{}
	golden, err := ioutil.ReadFile(goldenPath)
	require.Nil(t, err)
	err = json.Unmarshal(golden, &expected)
	require.Nil(t, err)

	assert.Equal(t, expected, torrent)
}

func TestToTorrentFile(t *testing.T) {
	tests := map[string]struct {
		input  *bencodeTorrent
		output TorrentFile
		fails  bool
	}{
		"correct conversion": {
			input: &bencodeTorrent{
				Announce: "http://bttracker.debian.org:6969/announce",
				Info: bencodeInfo{
					Pieces:      "1234567890abcdefghijabcdefghij1234567890",
					PieceLength: 262144,
					Length:      351272960,
					Name:        "debian-10.2.0-amd64-netinst.iso",
				},
			},
			output: TorrentFile{
				Announce: "http://bttracker.debian.org:6969/announce",
				InfoHash: [20]byte{216, 247, 57, 206, 195, 40, 149, 108, 204, 91, 191, 31, 134, 217, 253, 207, 219, 168, 206, 182},
				PieceHashes: [][20]byte{
			
    
func TestToTorrentFile(t *testing.T) {
	tests := map[string]struct {
		input  *bencodeTorrent
		output TorrentFile
		fails  bool
	}{
		"correct conversion": {
			input: &bencodeTorrent{
				Announce: "http://bttracker.debian.org:6969/announce",
				Info: bencodeInfo{
					Pieces:      "1234567890abcdefghijabcdefghij1234567890",
					PieceLength: 262144,
					Length:      351272960,
					Name:        "debian-10.2.0-amd64-netinst.iso",
				},
			},
			output: TorrentFile{
				Announce: "http://bttracker.debian.org:6969/announce",
				InfoHash: [20]byte{216, 247, 57, 206, 195, 40, 149, 108, 204, 91, 191, 31, 134, 217, 253, 207, 219, 168, 206, 182},
				PieceHashes: [][20]byte{
					{49, 50, 51, 52, 53, 54, 55, 56, 57, 48, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106},
					{97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 49, 50, 51, 52, 53, 54, 55, 56, 57, 48},
				},
				PieceLength: 262144,
				Length:      351272960,
				Name:        "debian-10.2.0-amd64-netinst.iso",
			},
			fails: false,
		},
		"not enough bytes in pieces": {
			input: &bencodeTorrent{
				Announce: "http://bttracker.debian.org:6969/announce",
				Info: bencodeInfo{
					Pieces:      "1234567890abcdefghijabcdef", // Only 26 bytes
					PieceLength: 262144,
					Length:      351272960,
					Name:        "debian-10.2.0-amd64-netinst.iso",
				},
			},
			output: TorrentFile{},
			fails:  true,
		},
	}

	for _, test := range tests {
		to, err := test.input.toTorrentFile()
		if test.fails {
			assert.NotNil(t, err)
		} else {
			assert.Nil(t, err)
		}
		assert.Equal(t, test.output, to)
	}
}