checking route access for authenticated role

I'm outputting a link, made using Url::fromRoute(). If the current user is anonymous, and the route is not accessible to them, I'd like to show a 'Log in to use this link' text instead, simular to what comment module does.

But I want to show that link only if logging in would actually allow that. So I want to check $url->access() for an authenticated user.

I've tried making a temporary user entity with the authenticate role like this:

$dummy_authenticated_user = User::create([
  'roles' => [
    AccountInterface::AUTHENTICATED_ROLE,
  ],
]);

if ($url->access($dummy_authenticated_user)) {
  // ...
}

but that doesn't work because in the User entity class, the check for authenticated uses the uid:

public function isAuthenticated() {
  return $this->id() > 0;
}

Is there a way to do this?

It's not necessary to create a user entity, you only need a user session object. Minimum requirement is that it implements AccountInterface:

$account = new UserSession([
  'uid' => 42,
  'roles' => ['authenticated'],
]);

$access = $url->access($account);