def METHOD_NAME(
    self, nested_severity_ruleset_source
):
    rules = SeverityRules.load(nested_severity_ruleset_source)
    alert = Mock()
    alert.netbox.room.id = "Milliways"
    alert.netbox.room.location.id = "The end of the Universe"
    alert.netbox.category = "SW"
    assert rules.evaluate(alert) == 1