How to test filters are active on route?

Upgraded to 4.1.3 just to be able to start adding tests to my project but fails miserably on the first hurdle.
I have many, many routes configured (~100) and most of them require a JWT token with specific privileges. When trying the steps from https://codeigniter.com/user_guide/testi...er-testing I get nothing in return from any of the routes tested. I know there are filters defined because they run with the requests coming in normally.

In my test:

PHP Code:

public function testFiltersForAdminRoutes() {
        $this->assertFilter('companies/proctors', 'before', 'bearer-auth:comp');
} 


In my Config/Routes.php

PHP Code:

$routes->group('companies', ['filter' => 'bearer-auth:comp'], function($routes) {
    $routes->get('proctors', 'Companies::proctors');
} 


What gets me puzzled is this line from the description of Filter Testing:

$filtersConfig The default Config\Filters configuration (note: discovery is handle by Filters so this will not include module aliases)

All filters I have designed are aliases defined in Config/Filters.php - can I not do that?
I am trying to make sure the correct filters are executed based on the route - is that not possible?

Any help greatly appreciated!
/Mattias