See ``authenticate_with_certificate_chain``.

    :param pem.Certificate client_cert: The client certificate to use.

def authenticate_with_certificate(reactor, base_url, client_cert, client_key, ca_cert):
    """
    See ``authenticate_with_certificate_chain``.

    :param pem.Certificate client_cert: The client certificate to use.
    """
    return authenticate_with_certificate_chain(
        reactor, base_url, [client_cert], client_key, ca_cert,
    )