fixing tests

Author: Jacq

examples/flush_adapter.php

@@ -8,8 +8,9 @@
 
 if ($adapterName === 'redis') {
     define('REDIS_HOST', $_SERVER['REDIS_HOST'] ?? '127.0.0.1');
+    define('REDIS_SENTINEL_HOST', $_SERVER['REDIS_SENTINEL_HOST'] ?? '127.0.0.1');
 
-    $adapter = new Prometheus\Storage\Redis(['host' => REDIS_HOST]);
+    $adapter = new Prometheus\Storage\Redis(['host' => REDIS_HOST, 'sentinel' => ['host' => REDIS_SENTINEL_HOST]]);
 } elseif ($adapterName === 'apc') {
     $adapter = new Prometheus\Storage\APC();
 } elseif ($adapterName === 'apcng') {