fix: check if wp_cache_delete exists before calling in unit tests

Author: Алексей Тихомиров

src/Queue/DatabaseQueue.php

@@ -119,7 +119,9 @@ public function isEmpty(string $queue = 'default'): bool
     protected function getQueue(string $queue): array
     {
         // Clear cache to ensure we get fresh data from DB
-        wp_cache_delete($this->queueKey($queue), 'site-options');
+        if (function_exists('wp_cache_delete')) {
+            wp_cache_delete($this->queueKey($queue), 'site-options');
+        }
 
         return get_site_option($this->queueKey($queue), []);
     }
@@ -152,7 +154,7 @@ protected function store(string $queue, JobInterface $job, int $availableAt): vo
 
     protected function queueKey(string $queue): string
     {
-        return self::PREFIX.'jobs_'.$queue;
+        return self::PREFIX . 'jobs_' . $queue;
     }
 
     /**
@@ -166,14 +168,14 @@ protected function getAllQueues(): array
             return ['default'];
         }
 
-        $prefix = self::PREFIX.'jobs_';
+        $prefix = self::PREFIX . 'jobs_';
         $results = $wpdb->get_col(
             $wpdb->prepare(
                 "SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE %s",
-                $prefix.'%',
+                $prefix . '%',
             ),
         );
 
-        return array_map(fn ($key) => str_replace($prefix, '', $key), $results);
+        return array_map(fn($key) => str_replace($prefix, '', $key), $results);
     }
 }