func assertGet(c *gc.C, stor blobstore.ResourceStorage, path, expected string) {
r, err := stor.Get(path)
c.Assert(err, gc.IsNil)
defer r.Close()
data, err := ioutil.ReadAll(r)
c.Assert(err, gc.IsNil)
c.Assert(data, gc.DeepEquals, []byte(expected))
}
func assertPut(c *gc.C, stor blobstore.ResourceStorage, path, data string) {
r := strings.NewReader(data)
checksum, err := stor.Put(path, r, int64(len(data)))
c.Assert(err, gc.IsNil)
md5Hash := md5.New()
_, err = md5Hash.Write([]byte(data))
c.Assert(err, gc.IsNil)
c.Assert(checksum, gc.Equals, hex.EncodeToString(md5Hash.Sum(nil)))
assertGet(c, stor, path, data)
}