[tests] more strictness

core/cacheengine.php

@@ -70,7 +70,7 @@ class EventTracingCache implements CacheInterface
     /**
      * @param string[] $keys
      * @param mixed $default
-     * @return mixed[]
+     * @return iterable<mixed>
      */
     public function getMultiple($keys, $default = null)
     {
@@ -126,10 +126,10 @@ function loadCache(?string $dsn): CacheInterface
             } elseif ($url['scheme'] == "redis") {
                 $redis = new \Predis\Client([
                     'scheme' => 'tcp',
-                    'host' => $url['host'],
-                    'port' => $url['port'],
-                    'username' => $url['user'],
-                    'password' => $url['pass'],
+                    'host' => $url['host'] ?? "127.0.0.1",
+                    'port' => $url['port'] ?? 6379,
+                    'username' => $url['user'] ?? null,
+                    'password' => $url['pass'] ?? null,
                 ], ['prefix' => 'shm:']);
                 $c = new \Naroga\RedisCache\Redis($redis);
             }