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")
}
}
func main() {
w := bzip2.NewWriter(os.Stdout)
if _, err := io.Copy(w, os.Stdin); err != nil {
log.Fatalf("bzipper: %v\n", err)
}
if err := w.Close(); err != nil {
log.Fatalf("bzipper: close: %v\n", err)
}
}