silverstripe-cms/tests/php/Controllers/RootURLControllerTest.php

<?php

namespace SilverStripe\CMS\Tests\Controllers;

use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\CMS\Controllers\RootURLController;
use SilverStripe\Core\Config\Config;
use SilverStripe\Dev\SapphireTest;

class RootURLControllerTest extends SapphireTest
{
    protected static $fixture_file = 'RootURLControllerTest.yml';

    public function testGetHomepageLink()
    {
        $default = $this->objFromFixture(SiteTree::class, 'home');

        Config::modify()->set(SiteTree::class, 'nested_urls', false);
        $this->assertEquals('home', RootURLController::get_homepage_link());
        Config::modify()->set(SiteTree::class, 'nested_urls', true);
        $this->assertEquals('home', RootURLController::get_homepage_link());
    }
}