SAML2\Assertion::getEncryptionKey PHP Method

    public function getEncryptionKey()
    {
        return $this->encryptionKey;
    }

    public function testEncryptedAttributeValuesWithComplexTypeValuesAreParsedCorrectly()
    {
        $xml = <<<XML
            <saml:Assertion
                    xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
                    xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
                    xmlns:xs="http://www.w3.org/2001/XMLSchema"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    Version="2.0"
                    ID="_93af655219464fb403b34436cfb0c5cb1d9a5502"
                    IssueInstant="1970-01-01T01:33:31Z">
      <saml:Issuer>Provider</saml:Issuer>
      <saml:Conditions/>
      <saml:AttributeStatement>
        <saml:Attribute Name="urn:some:custom:outer:element" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri">
            <saml:AttributeValue>
                <saml:Attribute Name="urn:some:custom:nested:element">
                    <saml:AttributeValue>abcd-some-value-xyz</saml:AttributeValue>
                </saml:Attribute>
            </saml:AttributeValue>
        </saml:Attribute>
        <saml:Attribute Name="urn:EntityConcernedSubID" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri">
            <saml:AttributeValue xsi:type="xs:string">string</saml:AttributeValue>
        </saml:Attribute>
      </saml:AttributeStatement>
    </saml:Assertion>
XML;
        $privateKey = CertificatesMock::getPublicKey();
        $assertion = new Assertion(DOMDocumentFactory::fromString($xml)->firstChild);
        $assertion->setEncryptionKey($privateKey);
        $assertion->setEncryptedAttributes(true);
        $this->assertEquals($privateKey, $assertion->getEncryptionKey());
        $encryptedAssertion = $assertion->toXML()->ownerDocument->saveXML();
        $assertionToVerify = new Assertion(DOMDocumentFactory::fromString($encryptedAssertion)->firstChild);
        $this->assertTrue($assertionToVerify->hasEncryptedAttributes());
        $assertionToVerify->decryptAttributes(CertificatesMock::getPrivateKey());
        $attributes = $assertionToVerify->getAttributes();
        $this->assertInstanceOf('\\DOMNodeList', $attributes['urn:some:custom:outer:element'][0]);
        $this->assertXmlStringEqualsXmlString($xml, $assertionToVerify->toXML()->ownerDocument->saveXML());
    }