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Best Value: candidate-priced fills, key copy, detail total

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FuelBoard Contributor
2026-10-14 10:43:12 +01:00
parent 2ed9cbf4e8
commit 3c424ab397
9 changed files with 218 additions and 80 deletions
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FuelBoardTests/Tests/FuelBoardSharedTests/FuelSavingsTests.swift
+7 -7
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@@ -8,15 +8,15 @@ final class FuelSavingsCalculatorTests: XCTestCase {
XCTAssertEqual(FuelSavingsCalculator.fuelUsedLitres(distanceMiles: 10, mpg: 45), 1.0102, accuracy: 0.0001)
}
func testPoundsBudgetConvertsToLitresUsingBaselinePrice() throws {
func testPoundsBudgetConvertsToLitresUsingGivenPrice() throws {
let amount = FuelSavingsFillAmount(value: 40, unit: .pounds)
let litres = try FuelSavingsCalculator.fillLitres(amount: amount, baselinePricePencePerLitre: 160)
let litres = try FuelSavingsCalculator.fillLitres(amount: amount, pricePencePerLitre: 160)
XCTAssertEqual(litres, 25.0, accuracy: 0.0001)
}
func testLitresAmountPassesThrough() throws {
let amount = FuelSavingsFillAmount(value: 35, unit: .litres)
let litres = try FuelSavingsCalculator.fillLitres(amount: amount, baselinePricePencePerLitre: 160)
let litres = try FuelSavingsCalculator.fillLitres(amount: amount, pricePencePerLitre: 160)
XCTAssertEqual(litres, 35, accuracy: 0.0001)
}
@@ -29,11 +29,11 @@ final class FuelSavingsCalculatorTests: XCTestCase {
baselineJourneyMiles: 2,
candidateJourneyMiles: 8
)
XCTAssertEqual(result.fillLitres, 25, accuracy: 0.0001)
XCTAssertEqual(result.grossSavingGBP, 2.50, accuracy: 0.0001)
XCTAssertEqual(result.fillLitres, 26.6667, accuracy: 0.0001)
XCTAssertEqual(result.grossSavingGBP, 2.6667, accuracy: 0.0001)
XCTAssertEqual(result.extraDistanceMiles, 6, accuracy: 0.0001)
XCTAssertEqual(result.extraDrivingCostGBP, 0.9092, accuracy: 0.0001)
XCTAssertEqual(result.netSavingGBP, 1.5908, accuracy: 0.0001)
XCTAssertEqual(result.netSavingGBP, 1.7574, accuracy: 0.0001)
XCTAssertEqual(result.status, .worthTheDrive)
}
@@ -61,7 +61,7 @@ final class FuelSavingsCalculatorTests: XCTestCase {
}
func testInvalidInputsRejected() {
XCTAssertThrowsError(try FuelSavingsCalculator.fillLitres(amount: FuelSavingsFillAmount(value: 40, unit: .pounds), baselinePricePencePerLitre: 0))
XCTAssertThrowsError(try FuelSavingsCalculator.fillLitres(amount: FuelSavingsFillAmount(value: 40, unit: .pounds), pricePencePerLitre: 0))
XCTAssertThrowsError(try FuelSavingsCalculator.calculate(mpg: 0, amount: FuelSavingsFillAmount(value: 40, unit: .pounds), baselinePricePencePerLitre: 160, candidatePricePencePerLitre: 150, baselineJourneyMiles: 1, candidateJourneyMiles: 2))
XCTAssertThrowsError(try FuelSavingsCalculator.calculate(mpg: 500, amount: FuelSavingsFillAmount(value: 40, unit: .pounds), baselinePricePencePerLitre: 160, candidatePricePencePerLitre: 150, baselineJourneyMiles: 1, candidateJourneyMiles: 2))
}