public function testToString()
{
$org = new Organization((object) ['id' => '123', 'profile' => (object) ['name' => 'My Org']]);
$org_site = new OrganizationSiteMembership((object) ['site' => (object) [], 'tags' => (object) []], ['collection' => (object) ['organization' => $org]]);
$this->assertEquals('123: My Org', (string) $org_site);
}