sentinelErr := errors.New("TestVerifyPeerCertificate")

	verifyPeerCertificateCallback := func(called *bool, rawCerts [][]byte, validatedChains [][]*x509.Certificate) error {
		if l := len(rawCerts); l != 1 {
			return fmt.Errorf("got len(rawCerts) = %d, wanted 1", l)
		}
		if len(validatedChains) == 0 {
			return errors.New("got len(validatedChains) = 0, wanted non-zero")
		}

			}
			clientConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
				clientVerifyPeerCertificates = true
				return nil
			}
			serverConfig.VerifyConnection = func(cs ConnectionState) error {
				serverVerifyConnection = true
				return nil
			}
			serverConfig.VerifyPeerCertificate = func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {

	// rawCerts may be empty on the server if ClientAuth is RequestClientCert or
	// VerifyClientCertIfGiven.
	//
	// This callback is not invoked on resumed connections, as certificates are
	// not re-verified on resumption.
	//
	// verifiedChains and its contents should not be modified.
	VerifyPeerCertificate func(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error