private function checkKD(SSODescriptor $descriptor, $use, $certificate)
{
$arrKD = $descriptor->getAllKeyDescriptorsByUse($use);
/** @var KeyDescriptor $kd */
$kd = array_shift($arrKD);
$this->assertNotNull($kd);
$this->assertEquals($use, $kd->getUse());
$this->assertNotEmpty($kd->getCertificate()->getData());
$this->assertEquals($certificate, $kd->getCertificate()->getData());
}
