(endpoint_template)
Update an existing template for the external API.

        :param six.text_type endpoint_template: a :obj:`IEndpointTemplate` to add to the
            :obj:`IExternalAPIMock` instance
        :raises: IndexError if the endpoint template does not already exist
        :raises: TypeError if the endpoint template does not implement
            the expected interface (IEndpointTempalte)
Update an existing template for the external API.
Update an existing template for the external API .
def update_template(endpoint_template):  # pragma:nocover
        """
        Update an existing template for the external API.

        :param six.text_type endpoint_template: a :obj:`IEndpointTemplate` to add to the
            :obj:`IExternalAPIMock` instance
        :raises: IndexError if the endpoint template does not already exist
        :raises: TypeError if the endpoint template does not implement
            the expected interface (IEndpointTempalte)
        """
def update_template ( endpoint_template ) : # pragma:nocover