def METHOD_NAME(self):
    """Registering a core key/value will allow it to be included in the
    list returned by config_option_list action."""
    key = "ckan.datasets_per_page"
    value = 5
    params = {key: value}
    # add registered core value
    helpers.call_action("config_option_update", **params)
    option_list = helpers.call_action("config_option_list")
    assert key in option_list