public function testGetRates()
{
$stats = new Stats();
$this->assertEquals(0, $stats->getRequestRate());
$this->assertEquals(0, $stats->getHitRate());
$this->assertEquals(0, $stats->getMissRate());
$stats->setUptime(200);
$stats->setGetHits(120);
$stats->setGetMisses(240);
$this->assertEquals(1.8, $stats->getRequestRate());
$this->assertEquals(0.6, $stats->getHitRate());
$this->assertEquals(1.2, $stats->getMissRate());
}