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: bzip2_test.go
    path of file: ./repos/learning/golang/source_code/gopl.io/ch13/bzip-print
    
    the code of the file until where you have to start completion: // Copyright Â© 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/

package bzip_test

import (
	"bytes"
	"compress/bzip2" // reader
	"io"
	"testing"

	"gopl.io/ch13/bzip" // writer
)

func TestBzip2(t *testing.T) {
	var compressed, uncompressed bytes.Buffer
	w := bzip.NewWriter(&compressed)

	// Write a repetitive message in a million pieces,
	// com
    
func TestBzip2(t *testing.T) {
	var compressed, uncompressed bytes.Buffer
	w := bzip.NewWriter(&compressed)

	// Write a repetitive message in a million pieces,
	// compressing one copy but not the other.
	tee := io.MultiWriter(w, &uncompressed)
	for i := 0; i < 1000000; i++ {
		io.WriteString(tee, "hello")
	}
	if err := w.Close(); err != nil {
		t.Fatal(err)
	}

	// Check the size of the compressed stream.
	if got, want := compressed.Len(), 255; got != want {
		t.Errorf("1 million hellos compressed to %d bytes, want %d", got, want)
	}

	// Decompress and compare with original.
	var decompressed bytes.Buffer
	io.Copy(&decompressed, bzip2.NewReader(&compressed))
	if !bytes.Equal(uncompressed.Bytes(), decompressed.Bytes()) {
		t.Error("decompression yielded a different message")
	}
}