public function testBytes()
{
list($handler, $repo, $auth, $keygen) = $this->getMocks();
$instance = new Storage($handler, $repo, $auth, $keygen);
$repo->shouldReceive('sum')->twice()->andReturn(15116107);
$bytes = $instance->bytes([], false);
$this->assertEquals(15116107, $bytes);
$bytes = $instance->bytes();
$this->assertEquals(15116107, $bytes);
}