public function testCacheProvider()
 {
     $TMP_DIR = __DIR__ . '/tmp/';
     $cacheProviders = [new ArrayCache(), new ChainCache([new ArrayCache()]), new FilesystemCache($TMP_DIR), new PhpFileCache($TMP_DIR)];
     $request = new Request('GET', 'test.local');
     $response = new Response(200, ['Cache-Control' => 'max-age=60'], 'Test content');
     /** @var CacheProvider $cacheProvider */
     foreach ($cacheProviders as $cacheProvider) {
         $this->rrmdir($TMP_DIR);
         $cache = new PrivateCache($cacheProvider);
         $cache->cache($request, $response);
         $entry = $cache->fetch($request);
         $this->assertNotNull($entry);
         $this->assertEquals((string) $response->getBody(), (string) $entry->getResponse()->getBody());
     }
     $this->rrmdir($TMP_DIR);
 }