getMetaStorageValues example

$time = \DateTimeImmutable::createFromFormat('U', time() + 5);
        $this->setNextResponse(200, ['Cache-Control' => 'public', 'Expires' => $time->format(\DATE_RFC2822)]);

        $this->request('GET', '/');
        $this->assertEquals(200, $this->response->getStatusCode());
        $this->assertEquals('Hello World', $this->response->getContent());
        $this->assertNotNull($this->response->headers->get('Date'));
        $this->assertNotNull($this->response->headers->get('X-Content-Digest'));
        $this->assertTraceContains('miss');
        $this->assertTraceContains('store');

        $values = $this->getMetaStorageValues();
        $this->assertCount(1, $values);
    }

    public function testCachesResponsesWithAMaxAgeDirective()
    {
        $this->setNextResponse(200, ['Cache-Control' => 'public, max-age=5']);

        $this->request('GET', '/');
        $this->assertEquals(200, $this->response->getStatusCode());
        $this->assertEquals('Hello World', $this->response->getContent());
        $this->assertNotNull($this->response->headers->get('Date'));