package main

import (
	"bytes"
	"context"
	"crypto/md5"
	"io"
	"testing"

	"gocloud.dev/blob"
	"gocloud.dev/blob/memblob"
)

func TestMD5(t *testing.T) {
	bucket := memblob.OpenBucket(nil)
	defer bucket.Close()

	var buf bytes.Buffer
	buf.WriteString("foobar")

	actualMD5 := md5.Sum(buf.Bytes())
	emptyMD5 := md5.Sum([]byte{})

	err := bucket.Upload(context.Background(), "foo", &buf, &blob.WriterOptions{
		ContentType: "text/plain",
		ContentMD5:  actualMD5[:], // Comment this line out to see the stored checksum, which is also equal to emptyMD5
	})
	if err != nil {
		t.Error(err)
	}

	iter := bucket.List(nil)
	for {
		obj, err := iter.Next(context.Background())
		if err == io.EOF {
			break
		}
		if err != nil {
			t.Error(err)
		}
		t.Logf("%X - stored md5 of %s", obj.MD5, obj.Key)
	}

	t.Logf("%X - actual md5", actualMD5)
	t.Logf("%X - empty md5", emptyMD5)
}