private static function cache_wp_files() { self::$cache_dir = sys_get_temp_dir() . '/wp-cli-test core-download-cache'; if (is_readable(self::$cache_dir . '/wp-config-sample.php')) { return; } $cmd = Utils\esc_cmd('wp core download --force --path=%s', self::$cache_dir); Process::create($cmd, null, self::get_process_env_variables())->run_check(); }