Verify Nonce returns false – Request Nonce returns correct value

You need to pass the action to check your nonce against, wp_verify_nonce has two parameters.

if($_POST && wp_verify_nonce($_REQUEST['test_slider_options_nonce'],'test_slider_action'))
    echo "TEST";

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