SAML2\Assertion::getAuthenticatingAuthority PHP Method

    public function getAuthenticatingAuthority()
    {
        return $this->AuthenticatingAuthority;
    }

    public function testUnmarshalling()
    {
        // Unmarshall an assertion
        $xml = <<<XML
<saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
                ID="_593e33ddf86449ce4d4c22b60ac48e067d98a0b2bf"
                Version="2.0"
                IssueInstant="2010-03-05T13:34:28Z"
>
  <saml:Issuer>testIssuer</saml:Issuer>
  <saml:Conditions>
    <saml:AudienceRestriction>
      <saml:Audience>audience1</saml:Audience>
      <saml:Audience>audience2</saml:Audience>
    </saml:AudienceRestriction>
  </saml:Conditions>
  <saml:AuthnStatement AuthnInstant="2010-03-05T13:34:28Z">
    <saml:AuthnContext>
      <saml:AuthnContextClassRef>someAuthnContext</saml:AuthnContextClassRef>
      <saml:AuthenticatingAuthority>someIdP1</saml:AuthenticatingAuthority>
      <saml:AuthenticatingAuthority>someIdP2</saml:AuthenticatingAuthority>
    </saml:AuthnContext>
  </saml:AuthnStatement>
</saml:Assertion>
XML;
        $document = DOMDocumentFactory::fromString($xml);
        $assertion = new Assertion($document->firstChild);
        // Test for valid audiences
        $assertionValidAudiences = $assertion->getValidAudiences();
        $this->assertCount(2, $assertionValidAudiences);
        $this->assertEquals('audience1', $assertionValidAudiences[0]);
        $this->assertEquals('audience2', $assertionValidAudiences[1]);
        // Test for Authenticating Authorities
        $assertionAuthenticatingAuthorities = $assertion->getAuthenticatingAuthority();
        $this->assertCount(2, $assertionAuthenticatingAuthorities);
        $this->assertEquals('someIdP1', $assertionAuthenticatingAuthorities[0]);
        $this->assertEquals('someIdP2', $assertionAuthenticatingAuthorities[1]);
    }