phpunit how to test a method which uses the browser url - php

Question

I have the following methods:
public function isAdmin()
{
$adminUrl = $this->getPage(2)->httpUrl;
/*
* Remove all segments except the first in the URL path
* to detect if current page is in admin view
*/
$currentUrl = preg_replace( // https://regex101.com/r/D0mOz9/1
sprintf(
'~(?<adminUrl>%s)(?<remove>.*)$~',
addslashes($adminUrl)
),
'$1',
$this->getPage()->httpUrl
);
return $adminUrl == $currentUrl || (!$currentUrl && !$this->getPage() instanceof NullPage);
}
public function getPage($page = null)
{
$wiredPage = $this->wire('page');
if (!is_null($wiredPage) && is_null($page)) {
$baseUrl = $this->wire('page')->url;
$urlSegmentStr = $this->wire('input')->urlSegmentStr;
if (strlen($urlSegmentStr)) {
$baseUrl = rtrim($baseUrl, '/') . "/$urlSegmentStr/";
}
return $this->pages->get($baseUrl);
}
if (is_null($page)) {
return $this->pages->get(parse_url(getenv('REQUEST_URI'), PHP_URL_PATH));
}
return $this->pages->get($page);
}
I check if for an admin page by getting the url to the admin page and compare it to the current url.
Now I want to write a test for it with PHPunit but I have no idea how to test a method which result is based on urls like this.
Is it possible to write a test for a case like this? How would I be able to do this?