laravel testing call params explanation $this->call()

laravel request call params.txt

        $response = $this->call(
            'POST',
            $path = '/api/foo,
            $params,
            [],
            ['file' => $uploadedFile], // instance of new \Symfony\Component\HttpFoundation\File\UploadedFile
            $auth
        );
        
        call($method, $uri, $parameters = [], $cookies = [], $files = [], $server = [], $headers = null)
        
      
      http-foundation/Request.php
      
    public function initialize(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null)