def METHOD_NAME(self):
    old = self.db.put(BytesIO(b"content"), meta=self.new_meta())
    with self.db.get(meta=old) as fh:
        new = self.db.put(fh, meta=self.new_meta())
    with self.db.get(meta=new) as fh:
        self.assertEqual(fh.read(), b"content")