How to get POST, GET data in fat free?

Question

PHP

Hello good people!
Recently started using php framework fat-free and faced this kind of issue for me.

$f3 = require 'lib/base.php';
$f3->route ( 'POST /', function () {
  echo 'test1: ' . $_POST['test'];
  echo 'test2: ' . $f3->post('POST.test');
  echo 'test3: ' . $f3->post('PARAMS.test');
} );
$f3->run ();

The first one works.
The other two methods don't work.