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@@ -0,0 +1,127 @@
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+import Foundation
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+import Testing
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+
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+@testable import Trio
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+
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+@Suite("Trio Alerts: ForecastedGlucoseEvaluator") struct ForecastedGlucoseEvaluatorTests {
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+ /// Builds a `Determination` defaulting every non-predictions field, varying only `predictions`.
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+ private func makeDetermination(predictions: Predictions?) -> Determination {
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+ Determination(
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+ id: nil,
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+ reason: "",
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+ units: nil,
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+ insulinReq: nil,
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+ eventualBG: nil,
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+ sensitivityRatio: nil,
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+ rate: nil,
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+ duration: nil,
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+ iob: nil,
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+ cob: nil,
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+ predictions: predictions,
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+ deliverAt: nil,
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+ carbsReq: nil,
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+ temp: nil,
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+ bg: nil,
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+ reservoir: nil,
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+ isf: nil,
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+ timestamp: nil,
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+ tdd: nil,
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+ current_target: nil,
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+ minDelta: nil,
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+ expectedDelta: nil,
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+ minGuardBG: nil,
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+ minPredBG: nil,
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+ threshold: nil,
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+ carbRatio: nil,
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+ received: nil
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+ )
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+ }
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+
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+ @Test("Reduces to min across all four curves at default horizon (+20min, index 4)") func minAcrossAllFourCurves() {
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+ let predictions = Predictions(
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+ iob: [100, 101, 102, 103, 104],
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+ zt: [130, 131, 132, 133, 99],
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+ cob: [110, 111, 112, 113, 90],
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+ uam: [120, 121, 122, 123, 95]
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+ )
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+ let determination = makeDetermination(predictions: predictions)
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+
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+ let result = ForecastedGlucoseEvaluator.evaluate(determination: determination)
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+ #expect(result != nil)
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+ #expect(result?.predictedGlucose == Decimal(90))
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+ #expect(result?.horizonMinutes == 20)
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+ #expect(result?.curvesUsed == Set([.iob, .cob, .uam, .zt]))
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+ #expect(result?.perCurve[.iob] == Decimal(104))
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+ #expect(result?.perCurve[.cob] == Decimal(90))
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+ #expect(result?.perCurve[.uam] == Decimal(95))
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+ #expect(result?.perCurve[.zt] == Decimal(99))
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+ }
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+
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+ @Test("nil predictions returns nil") func nilPredictionsReturnsNil() {
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+ let determination = makeDetermination(predictions: nil)
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+ #expect(ForecastedGlucoseEvaluator.evaluate(determination: determination) == nil)
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+ }
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+
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+ @Test("All curves shorter than the horizon index returns nil") func indexOutOfBoundsAllShortReturnsNil() {
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+ let predictions = Predictions(
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+ iob: [100, 101, 102],
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+ zt: [130, 131, 132],
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+ cob: [110, 111, 112],
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+ uam: [120, 121, 122]
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+ )
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+ let determination = makeDetermination(predictions: predictions)
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+ #expect(ForecastedGlucoseEvaluator.evaluate(determination: determination) == nil)
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+ }
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+
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+ @Test("Only one populated curve is used") func onlyOneCurvePopulated() {
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+ let predictions = Predictions(
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+ iob: [80, 81, 82, 83, 84],
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+ zt: nil,
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+ cob: nil,
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+ uam: nil
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+ )
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+ let determination = makeDetermination(predictions: predictions)
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+
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+ let result = ForecastedGlucoseEvaluator.evaluate(determination: determination)
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+ #expect(result != nil)
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+ #expect(result?.predictedGlucose == Decimal(84))
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+ #expect(result?.curvesUsed == Set([.iob]))
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+ }
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+
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+ @Test("Non-default horizon selects the matching index") func nonDefaultHorizonSelectsCorrectIndex() {
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+ let predictions = Predictions(
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+ iob: [100, 90, 80, 70],
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+ zt: nil,
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+ cob: [105, 95, 85, 75],
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+ uam: nil
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+ )
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+ let determination = makeDetermination(predictions: predictions)
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+
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+ let result = ForecastedGlucoseEvaluator.evaluate(determination: determination, horizonMinutes: 10)
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+ #expect(result != nil)
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+ #expect(result?.predictedGlucose == Decimal(80))
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+ #expect(result?.curvesUsed == Set([.iob, .cob]))
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+ #expect(result?.horizonMinutes == 10)
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+ }
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+
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+ @Test("Curves with differing lengths skip those missing the index") func differingLengthsSomeMissing() {
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+ let predictions = Predictions(
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+ iob: [100, 101, 102, 103, 104],
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+ zt: [130, 131, 132],
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+ cob: [110, 111],
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+ uam: [120, 121, 122, 123, 70]
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+ )
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+ let determination = makeDetermination(predictions: predictions)
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+
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+ let result = ForecastedGlucoseEvaluator.evaluate(determination: determination)
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+ #expect(result != nil)
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+ #expect(result?.predictedGlucose == Decimal(70))
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+ #expect(result?.curvesUsed == Set([.iob, .uam]))
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+ }
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+
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+ @Test("All-empty arrays return nil") func emptyArraysReturnNil() {
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+ let predictions = Predictions(iob: [], zt: [], cob: [], uam: [])
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+ let determination = makeDetermination(predictions: predictions)
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+ #expect(ForecastedGlucoseEvaluator.evaluate(determination: determination) == nil)
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+ }
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+}
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James Woglom