Valdemar Lorenzen
75 lines
3.2 KiB
Swift
75 lines
3.2 KiB
Swift
import ConjureKit
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import Foundation
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import Testing
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@MainActor
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private final class RateRequests {
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var pending: [CheckedContinuation<CurrencyRates, any Error>] = []
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func fetch() async throws -> CurrencyRates {
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try await withCheckedThrowingContinuation { pending.append($0) }
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}
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}
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@MainActor
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private func waitForRates(_ condition: () -> Bool) async throws {
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// Scheduling deadline only; calculation freshness uses the injected clock.
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for _ in 0..<1_000 {
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if condition() { return }
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try await Task.sleep(for: .milliseconds(1))
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}
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try #require(condition(), "Currency calculation did not reach the expected state")
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}
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@Test @MainActor
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func currencyLifetimeSharesRefreshAndPreservesStaleCopyUntilFailure() async throws {
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var calendar = Calendar(identifier: .gregorian)
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calendar.timeZone = TimeZone(secondsFromGMT: 0)!
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var now = calendar.date(from: DateComponents(year: 2026, month: 1, day: 2, hour: 12))!
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let requests = RateRequests()
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let calculation = CurrencyCalculation(now: { now }, calendar: calendar, fetch: { try await requests.fetch() })
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var completions = 0
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calculation.changed = { completions += 1 }
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let snapshot = CurrencyRates(date: "2026-01-02", rates: ["eur": 1, "usd": 2, "dkk": 8])
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calculation.update("100 USD to DKK")
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#expect(calculation.isCurrency)
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#expect(calculation.result?.copyValue == nil)
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try await waitForRates { requests.pending.count == 1 }
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calculation.update("50 USD to DKK")
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requests.pending[0].resume(returning: snapshot)
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try await waitForRates { completions == 1 }
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#expect(calculation.result?.copyValue == "200 DKK")
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calculation.update("100 USD to DKK")
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#expect(calculation.result?.copyValue == "400 DKK")
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#expect(requests.pending.count == 1)
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now = calendar.date(byAdding: .day, value: 1, to: now)!
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calculation.update("100 USD to DKK")
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#expect(calculation.result?.copyValue == "400 DKK")
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#expect(calculation.result?.detail.contains("Stale cache; refreshing") == true)
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try await waitForRates { requests.pending.count == 2 }
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calculation.update("50 USD to DKK")
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requests.pending[1].resume(throwing: URLError(.notConnectedToInternet))
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try await waitForRates { completions == 2 }
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#expect(calculation.result?.copyValue == nil)
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#expect(calculation.result?.displayValue == "Currency rates unavailable")
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calculation.update("50 USD to DKK")
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#expect(calculation.result?.copyValue == nil)
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#expect(requests.pending.count == 2)
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calculation.update("25 USD to DKK")
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try await waitForRates { requests.pending.count == 3 }
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calculation.update("Safari") // Leaving currency does not cancel shared work.
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#expect(!calculation.isCurrency)
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#expect(calculation.result == nil)
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requests.pending[2].resume(returning: snapshot)
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try await waitForRates { completions == 3 }
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#expect(calculation.result == nil)
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calculation.update("25 USD to DKK")
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#expect(calculation.result?.copyValue == "100 DKK")
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#expect(requests.pending.count == 3) // Fetch day, not snapshot metadata, controls freshness.
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calculation.update("1 km to mi")
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#expect(!calculation.isCurrency)
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#expect(calculation.result?.copyValue == "0.621371192237 mi")
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}
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