Throw exception when can't ping redis server

Author: AliceWonderMiscreations

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": "~7.1.0 || ~7.2.0",
         "ext-redis": "~3.1.6 || ~4.0",
-        "awonderphp/simplecache": "dev-devel",
+        "awonderphp/simplecache": "dev-master",
         "psr/simple-cache": "^1.0"
     },
     "require-dev": {

lib/SimpleCacheRedis.php

@@ -41,6 +41,10 @@ protected function setRedisObject($obj): bool
         if (! $obj instanceof \Redis) {
             throw \AWonderPHP\SimpleCache\StrictTypeException::redisConnectorExpected($obj);
         }
+        $test = $obj->ping();
+        if ($test !== "+PONG") {
+            throw \AWonderPHP\SimpleCache\InvalidSetupException::pingNoPongRedis();
+        }
         $this->redis = $obj;
         return true;
     }//end setRedisObject()

lib/SimpleCacheRedisSodium.php

@@ -41,6 +41,10 @@ protected function setRedisObject($obj): bool
         if (! $obj instanceof \Redis) {
             throw \AWonderPHP\SimpleCache\StrictTypeException::redisConnectorExpected($obj);
         }
+        $test = $obj->ping();
+        if ($test !== "+PONG") {
+            throw \AWonderPHP\SimpleCache\InvalidSetupException::pingNoPongRedis();
+        }
         $this->redis = $obj;
         return true;
     }//end setRedisObject()