SAML2\Assertion::validate PHP Method

    public function validate(XMLSecurityKey $key)
    {
        assert('$key->type === \\RobRichards\\XMLSecLibs\\XMLSecurityKey::RSA_SHA1');
        if ($this->signatureData === null) {
            return false;
        }
        Utils::validateSignature($this->signatureData, $key);
        return true;
    }

    /**
     * Calling validate on an unsigned assertion must return
     * false, not an exception.
     */
    public function testVerifyUnsignedAssertion()
    {
        $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);
        // Was not signed
        $this->assertFalse($assertion->getWasSignedAtConstruction());
        $publicKey = CertificatesMock::getPublicKeySha1();
        $result = $assertion->validate($publicKey);
        $this->assertFalse($result);
    }