Rest API in integration tests – filtering by slug not working?

to add parameters when you use WP_REST_Request, you have to do that : 

$request = new WP_REST_Request('GET', "/wp/v2/pages");

$request->set_query_params([
    "slug" => $this->api_docs_page_id,
]);

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)