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: message_receipt_test.go
    path of file: ./repos/lotus/chain/types
    
    the code of the file until where you have to start completion: package types

import (
	"bytes"
	"encoding/hex"
	"testing"

	"github.com/ipfs/go-cid"
	"github.com/stretchr/testify/assert"
)

func TestMessageReceiptSerdeRoundrip(t *testing.T) {
	var (
		assert = assert.New(t)
		buf    = new(bytes.Buffer)
		err    error
	)

	randomCid, err := cid.Decode("bafy2bzacecu7n7wbtogznrtuuvf73dsz7wasgyneqasksdblxupnyovmtwxxu")
	assert.NoError(err)

	//
	// Version 0
	//
	mr := NewMessageReceiptV0(0, []byte{0x00, 0x01, 0x02, 0x04}, 42)

	// marshal
	err = mr.MarshalCBOR(buf)
	assert.NoError(err)

	t.Logf("version 0: %s\n", hex.EncodeToString(buf.Bytes()))

	// unmarshal
	var mr2 MessageReceipt
	err = mr2.UnmarshalCBOR(buf)
	assert.NoError(err)
	assert.Equal(mr, mr2)

	// version 0 with an events root -- should not serialize the events root!
	mr.EventsRoot = &randomCid

	buf.Reset()

	// marshal
	err = mr.MarshalCBOR(buf)
	assert.NoError(err)

	t.Logf("version 0 (with root): %s\n", hex.EncodeToString(buf.Bytes()))

	// unmarshal
	mr2 =
    
func TestMessageReceiptSerdeRoundrip(t *testing.T) {
	var (
		assert = assert.New(t)
		buf    = new(bytes.Buffer)
		err    error
	)

	randomCid, err := cid.Decode("bafy2bzacecu7n7wbtogznrtuuvf73dsz7wasgyneqasksdblxupnyovmtwxxu")
	assert.NoError(err)

	//
	// Version 0
	//
	mr := NewMessageReceiptV0(0, []byte{0x00, 0x01, 0x02, 0x04}, 42)

	// marshal
	err = mr.MarshalCBOR(buf)
	assert.NoError(err)

	t.Logf("version 0: %s\n", hex.EncodeToString(buf.Bytes()))

	// unmarshal
	var mr2 MessageReceipt
	err = mr2.UnmarshalCBOR(buf)
	assert.NoError(err)
	assert.Equal(mr, mr2)

	// version 0 with an events root -- should not serialize the events root!
	mr.EventsRoot = &randomCid

	buf.Reset()

	// marshal
	err = mr.MarshalCBOR(buf)
	assert.NoError(err)

	t.Logf("version 0 (with root): %s\n", hex.EncodeToString(buf.Bytes()))

	// unmarshal
	mr2 = MessageReceipt{}
	err = mr2.UnmarshalCBOR(buf)
	assert.NoError(err)
	assert.NotEqual(mr, mr2)
	assert.Nil(mr2.EventsRoot)

	//
	// Version 1
	//
	buf.Reset()
	mr = NewMessageReceiptV1(0, []byte{0x00, 0x01, 0x02, 0x04}, 42, &randomCid)

	// marshal
	err = mr.MarshalCBOR(buf)
	assert.NoError(err)

	t.Logf("version 1: %s\n", hex.EncodeToString(buf.Bytes()))

	// unmarshal
	mr2 = MessageReceipt{}
	err = mr2.UnmarshalCBOR(buf)
	assert.NoError(err)
	assert.Equal(mr, mr2)
	assert.NotNil(mr2.EventsRoot)
}