SAML2\Assertion::getAuthnContextClassRef PHP Method

    public function getAuthnContextClassRef()
    {
        return $this->authnContextClassRef;
    }

    /**
     * Tests that AuthnContextDeclRef is not mistaken for AuthnContextClassRef.
     *
     * This tests against reintroduction of removed behavior.
     */
    public function testNoAuthnContextDeclRefFallback()
    {
        $authnContextDeclRef = 'relative/url/to/authcontext.xml';
        // Unmarshall an assertion
        $document = DOMDocumentFactory::fromString(<<<XML
<saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
                xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
                ID="_593e33ddf86449ce4d4c22b60ac48e067d98a0b2bf"
                Version="2.0"
                 IssueInstant="2010-03-05T13:34:28Z"
>
  <saml:Issuer>testIssuer</saml:Issuer>
  <saml:AuthnStatement AuthnInstant="2010-03-05T13:34:28Z">
    <saml:AuthnContext>
      <saml:AuthnContextDeclRef>{$authnContextDeclRef}</saml:AuthnContextDeclRef>
    </saml:AuthnContext>
  </saml:AuthnStatement>
</saml:Assertion>
XML
);
        $assertion = new Assertion($document->firstChild);
        $this->assertEmpty($assertion->getAuthnContextClassRef());
        $this->assertEquals($authnContextDeclRef, $assertion->getAuthnContextDeclRef());
    }