Pest HTTP test use route helper instead static path

Route::get('/welcome', function () {
    return view('welcome');
})->name('welcome');

ref: https://pestphp.com/docs/higher-order-testing

i run php artisan test --parallel --group=my

route('welcome') prevented the Test start to run and throw an error

here the ->group('my') is for the whole test file

<?php

uses()->group('my');

test('welcome page is ok', function () {
    $this
        ->get('/welcome')
        ->assertOk();
});

test('welcome route is ok')
    ->get(route('welcome')) // <--- ERROR  Target class [url] does not exist.
    ->assertOk();

when i change to static path, all Test passed

test('welcome route is ok')
    ->get('/welcome')
    ->assertOk();

so how can use Laravel build-in helpers in the Pest Test?