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: commr_test.go
    path of file: ./repos/lotus/storage/sealer/commitment
    
    the code of the file until where you have to start completion: package commitment

import (
	"testing"

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

func TestCommR(t *testing.T) {
	var commC = [32]byte{
		0x09, 0x1e, 0x07, 0x3b, 0x98, 0x2f, 0x66, 0xf0,
		0x13, 0xc0, 0x26, 0xda, 0x6e, 0x54, 0xd8, 0x7d,
		0xbf, 0x8b, 0xba, 0x84, 0x8e, 0xf5, 0x7a, 0x55,
		0x29, 0xc7, 0xe7, 0xf7, 0x2c, 0x82, 0x88, 0x43,
	}

	var commRLast = [32]byte{
		0xf0, 0xc5, 0x78, 0x5c, 0x6c, 0x8c, 0xf6, 0x2d,
		0x96, 0x8b, 0x1e, 0xcd, 0x68, 0xed, 0xb9, 0xd9,
		0x1e, 0xb9, 0x44, 0x5c, 0x78, 0x58, 0xa6, 0x00,
		0x26, 0xf8, 0x82, 0x68, 0x60, 0xf7, 0xe7, 0x68,
	}

	res, err := CommR(commC, commRLast)
	require.NoError(t, err)

	var expected = [32]byte{
		0xe6, 0x74, 0xd1, 0x9e, 0x6c, 0xe7, 0xfc, 0xf3,
		0x3b, 0xbf, 0xd
    
func TestCommR(t *testing.T) {
	var commC = [32]byte{
		0x09, 0x1e, 0x07, 0x3b, 0x98, 0x2f, 0x66, 0xf0,
		0x13, 0xc0, 0x26, 0xda, 0x6e, 0x54, 0xd8, 0x7d,
		0xbf, 0x8b, 0xba, 0x84, 0x8e, 0xf5, 0x7a, 0x55,
		0x29, 0xc7, 0xe7, 0xf7, 0x2c, 0x82, 0x88, 0x43,
	}

	var commRLast = [32]byte{
		0xf0, 0xc5, 0x78, 0x5c, 0x6c, 0x8c, 0xf6, 0x2d,
		0x96, 0x8b, 0x1e, 0xcd, 0x68, 0xed, 0xb9, 0xd9,
		0x1e, 0xb9, 0x44, 0x5c, 0x78, 0x58, 0xa6, 0x00,
		0x26, 0xf8, 0x82, 0x68, 0x60, 0xf7, 0xe7, 0x68,
	}

	res, err := CommR(commC, commRLast)
	require.NoError(t, err)

	var expected = [32]byte{
		0xe6, 0x74, 0xd1, 0x9e, 0x6c, 0xe7, 0xfc, 0xf3,
		0x3b, 0xbf, 0xd9, 0xb3, 0x43, 0xa0, 0xce, 0xb1,
		0x2d, 0x28, 0x31, 0xd1, 0xda, 0x54, 0x31, 0x61,
		0x89, 0x1e, 0xbc, 0xca, 0xd2, 0xc6, 0xdb, 0x01,
	}

	require.Equal(t, res, expected)
}