crud: Custom Method class not found

I’m trying to add a custom action, following these instructions

http://crud.readthedocs.io/en/latest/actions/custom.html#using-custom-named-controller-actions

I have the following:

public function initialize() {
        
        parent::initialize();
        
        $this->loadComponent('Crud.Crud', [
            'actions' => [
                'test' => ['className' => 'App\Controller\test']
            ],
            'listeners' => ['Crud.Api'],             
        ],'RequestHandler'
        );
        
        $this->Crud->config(['listeners.api.exceptionRenderer' => 'App\Error\ExceptionRenderer']);
        $this->Crud->addListener('relatedModels', 'Crud.RelatedModels');

    }
    
    public function beforeFilter(Event $event){
        parent::beforeFilter($event);
        $this->Crud->addListener('Crud.Api');
    }

    public function test() {         
        $this->Crud->execute();
    }

When I call test.json I get the following:

message: “Class ‘App\Controller\TestAction’ not found”,

Also are the documents correct, it says to use: \App\Crud\Action\ but the top of my controller use the namespace: namespace App\Controller. I tried both but the result is the same - missing class.

What am I doing wrong?