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|
use tracing::trace;
use warden_core::{configuration::rule::Band, message::RuleResult};
pub(super) fn determine_outcome(value: i64, bands: &[Band], rule_result: &mut RuleResult) {
trace!("calculating outcome");
for band in bands {
let value_f64 = value as f64;
if band.lower_limit.is_none_or(|lower| value_f64 >= lower)
&& band.upper_limit.is_none_or(|upper| value_f64 < upper)
{
rule_result.sub_rule_ref = band.sub_rule_ref.to_owned();
rule_result.reason = band.reason.to_owned();
break;
}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn make_band(lower: Option<f64>, upper: Option<f64>, sub_ref: &str, reason: &str) -> Band {
Band {
lower_limit: lower,
upper_limit: upper,
sub_rule_ref: sub_ref.to_string(),
reason: reason.to_string(),
}
}
#[test]
fn matches_band_within_limits() {
let bands = vec![
make_band(Some(0.0), Some(10.0), "A", "Between 0 and 10"),
make_band(Some(10.0), Some(20.0), "B", "Between 10 and 20"),
];
let mut rule_result = RuleResult::default();
determine_outcome(5, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "A");
assert_eq!(rule_result.reason, "Between 0 and 10");
}
#[test]
fn matches_band_lower_inclusive_upper_exclusive() {
let bands = vec![
make_band(Some(0.0), Some(10.0), "A", "Between 0 and 10"),
make_band(Some(10.0), Some(20.0), "B", "Between 10 and 20"),
];
let mut rule_result = RuleResult::default();
determine_outcome(10, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "B");
assert_eq!(rule_result.reason, "Between 10 and 20");
}
#[test]
fn no_match_when_above_all_bands() {
let bands = vec![
make_band(Some(0.0), Some(10.0), "A", "Between 0 and 10"),
make_band(Some(10.0), Some(20.0), "B", "Between 10 and 20"),
];
let mut rule_result = RuleResult::default();
determine_outcome(30, &bands, &mut rule_result);
assert_eq!(rule_result, RuleResult::default());
}
#[test]
fn match_when_no_upper_limit() {
let bands = vec![
make_band(Some(0.0), None, "A", "Above 0"),
];
let mut rule_result = RuleResult::default();
determine_outcome(100, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "A");
assert_eq!(rule_result.reason, "Above 0");
}
#[test]
fn match_when_no_lower_limit() {
let bands = vec![
make_band(None, Some(50.0), "A", "Below 50"),
];
let mut rule_result = RuleResult::default();
determine_outcome(-10, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "A");
assert_eq!(rule_result.reason, "Below 50");
}
#[test]
fn match_when_no_limits() {
let bands = vec![
make_band(None, None, "A", "Any value"),
];
let mut rule_result = RuleResult::default();
determine_outcome(9999, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "A");
assert_eq!(rule_result.reason, "Any value");
}
#[test]
fn stops_after_first_match() {
let bands = vec![
make_band(None, None, "A", "Any value"),
make_band(None, None, "B", "Second band"),
];
let mut rule_result = RuleResult::default();
determine_outcome(5, &bands, &mut rule_result);
assert_eq!(rule_result.sub_rule_ref, "A");
assert_eq!(rule_result.reason, "Any value");
}
}
|
