Not connecting to DB

Is it possible to test database connection outside XAMPP ?

Yes, it is possilbe if you configure correctly.

I have this error, but the credentials are correct :

Main connection [MySQLi]: Access denied for user '****'@localhost (using password: YES)

---

Is this code of the Model correct ?
Shouldn't I have something like $this->db = \Config\Database::connect() in the constructor ?

No, you don't.

PHP Code:

class NewsModel extends Model
{
    protected $table = 'news';

    public function getNews($slug = false)
    {
        if ($slug === false) {
            return $this->findAll();
        }

        return $this->where(['slug' => $slug])->first();
    }
} 


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