How to use JWT in Unittest?

Question

JSON Web Token

How to send header with token in unit tests?
I send like this:

$client->request('GET', $router->generate('article_list'), [], [], ['HTTP_Authorization' => self::getJwt()]);

Gives error 500

First, an unauthorized user is checked (everything is in order), and later in the same test, the check is already with a token..