silverstripe-subsites/tests/BaseSubsiteTest.php

<?php
class BaseSubsiteTest extends SapphireTest
{
    public function setUp()
    {
        parent::setUp();

        Subsite::$use_session_subsiteid = true;
		Subsite::$force_subsite = null;
    }

    /**
     * Avoid subsites filtering on fixture fetching.
     */
    public function objFromFixture($class, $id)
    {
        Subsite::disable_subsite_filter(true);
        $obj = parent::objFromFixture($class, $id);
        Subsite::disable_subsite_filter(false);

        return $obj;
    }

    /**
     * Tests the initial state of disable_subsite_filter
     */
    public function testDisableSubsiteFilter()
    {
        $this->assertFalse(Subsite::$disable_subsite_filter);
    }
}