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@@ -0,0 +1,104 @@
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+import Foundation
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+import Testing
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+@testable import Trio
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+
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+@Suite("Determination: Expected Delta Calculation Tests") struct ExpectedDeltaTests {
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+ /// When delta is smaller than one 5-min block, only glucoseImpact is returned.
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+ @Test("no change when delta < 24 blocks") func deltaSmallerThanBlock() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(120),
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(2)
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+ )
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+ // delta = 20; Int(20)/24 = 0 → result = 2 + 0 = 2.0
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+ #expect(result == Decimal(2.0))
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+ }
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+
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+ /// When delta spans exactly one block, adds 1 to glucoseImpact.
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+ @Test("one block delta") func deltaExactlyOneBlock() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(124),
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(1.5)
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+ )
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+ // delta = 24; Int(24)/24 = 1 → result = 1.5 + 1 = 2.5
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+ #expect(result == Decimal(2.5))
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+ }
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+
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+ /// When delta spans multiple blocks, uses integer division.
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+ @Test("multi-block delta") func deltaMultipleBlocks() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(140),
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(0)
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+ )
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+ // delta = 40; Int(40)/24 = 1 → result = 0 + 1 = 1.0
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+ #expect(result == Decimal(1.0))
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+ }
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+
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+ /// Negative delta yields negative adjustment when blocks exceed delta.
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+ @Test("negative delta") func negativeDelta() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(80),
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(0)
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+ )
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+ // delta = -20; Int(-20)/24 = 0 (trunc toward zero) → result = 0 + 0 = 0.0
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+ #expect(result == Decimal(0.0))
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+ }
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+
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+ /// Fractional delta is truncated before block division.
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+ @Test("fractional delta truncation") func fractionalDelta() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(string: "125.5")!,
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(0)
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+ )
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+ // delta = 25.5; Int(25.5)=25; 25/24=1 → result = 1.0
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+ #expect(result == Decimal(1.0))
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+ }
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+
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+ /// Rounding to one decimal place works when glucoseImpact has two decimals.
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+ @Test("rounding one decimal place") func roundingOneDecimal() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(124),
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+ eventualGlucose: Decimal(100),
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+ glucoseImpact: Decimal(string: "1.27")!
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+ )
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+ // delta=24 → blocks=1; adjustment=1; 1.27+1=2.27 → rounded to 2.3
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+ #expect(result == Decimal(string: "2.3")!)
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+ }
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+
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+ /// Extreme high eventual glucose produces a large negative expected delta.
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+ @Test("extreme high eventual glucose") func extremeHighEventual() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(120),
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+ eventualGlucose: Decimal(350),
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+ glucoseImpact: Decimal(0)
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+ )
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+ // delta = 120 - 350 = -230; Int(-230)/24 = -9 → result = 0 + (-9) = -9.0
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+ #expect(result == Decimal(string: "-9.0")!)
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+ }
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+
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+ /// Extreme low eventual glucose produces a positive expected delta.
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+ @Test("extreme low eventual glucose") func extremeLowEventual() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(120),
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+ eventualGlucose: Decimal(39),
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+ glucoseImpact: Decimal(0)
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+ )
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+ // delta = 81; Int(81)/24 = 3 → result = 0 + 3 = 3.0
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+ #expect(result == Decimal(string: "3.0")!)
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+ }
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+
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+ /// Invalid low‐unit input (<39 mg/dL) falls back to only using glucoseImpact.
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+ @Test("invalid low input treated as only impact") func invalidLowInput() {
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+ let result = DeterminationGenerator.calculateExpectedDelta(
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+ targetGlucose: Decimal(5), // e.g. mmol/L mistakenly passed
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+ eventualGlucose: Decimal(3),
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+ glucoseImpact: Decimal(string: "1.7")!
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+ )
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+ // delta = 2; Int(2)/24 = 0 → result = 1.7 + 0 = 1.7
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+ #expect(result == Decimal(string: "1.7")!)
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+ }
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+}
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Deniz Cengiz