Add dateProvider to ExpiringValue lifetime duration initializers

Author: Prachi Gauriar

CHANGELOG.md

@@ -1,6 +1,14 @@
 # DevFoundation Changelog
 
 
+## 1.7.0: October 27, 2025
+
+This is a small release that updates `ExpiringValue` to work better with `DateProvider`.
+Specifically, the two initializers spelled `ExpiringValue.init(_:lifetimeDuration:)` have been
+updated to include an `any DateProvider` parameter that defaults to `DateProviders.current`. The new
+initializers are spelled `ExpiringValue.init(_:dateProvider:lifetimeDuration:)`.
+
+
 ## 1.6.0: October 24, 2025
 
 This release introduces the `LiveQuery` subsystem, a set of types for managing search-as-you-type

Sources/DevFoundation/Utility Types/ExpiringValue.swift

@@ -38,9 +38,14 @@ public struct ExpiringValue<Value> {
     ///
     /// - Parameters:
     ///   - value: The value.
+    ///   - dateProvider: The date provider to use to determine the current date.
     ///   - lifetimeDuration: The length of the value’s lifetime.
-    public init(_ value: Value, lifetimeDuration: Duration) {
-        let now = DateProviders.current.now
+    public init(
+        _ value: Value,
+        dateProvider: any DateProvider = DateProviders.current,
+        lifetimeDuration: Duration
+    ) {
+        let now = dateProvider.now
         self.value = value
         self.lifetimeRange = now ... (now + lifetimeDuration.timeInterval)
     }
@@ -52,9 +57,14 @@ public struct ExpiringValue<Value> {
     ///
     /// - Parameters:
     ///   - value: The value.
+    ///   - dateProvider: The date provider to use to determine the current date.
     ///   - lifetimeDuration: The length of the value’s lifetime.
-    public init(_ value: Value, lifetimeDuration: TimeInterval) {
-        self.init(value, lifetimeDuration: .seconds(lifetimeDuration))
+    public init(
+        _ value: Value,
+        dateProvider: any DateProvider = DateProviders.current,
+        lifetimeDuration: TimeInterval
+    ) {
+        self.init(value, dateProvider: dateProvider, lifetimeDuration: .seconds(lifetimeDuration))
     }
 
 

Tests/DevFoundationTests/Utility Types/ExpiringValueTests.swift

@@ -28,17 +28,31 @@ struct ExpiringValueTests: RandomValueGenerating {
 
     @Test
     mutating func durationInitSetsValuesCorrectly() {
+        let value = randomUUID()
+        let duration = Duration.milliseconds(randomInt(in: 0 ... 10_000))
+
+        let now = randomDate()
+        let dateProvider = MockDateProvider(now: now)
+        let expiringValue = ExpiringValue(value, dateProvider: dateProvider, lifetimeDuration: duration)
+
+        #expect(expiringValue.value == value)
+        #expect(expiringValue.lifetimeRange.lowerBound == now)
+        #expect(expiringValue.lifetimeRange.upperBound == now + duration.timeInterval)
+    }
+
+
+    @Test
+    mutating func timeIntervalDurationInitSetsValuesCorrectly() {
         let value = randomUUID()
         let duration = random(TimeInterval.self, in: 1 ... 10_000)
 
-        let date = Date()
-        let expiringValue = ExpiringValue(value, lifetimeDuration: duration)
+        let now = randomDate()
+        let dateProvider = MockDateProvider(now: now)
+        let expiringValue = ExpiringValue(value, dateProvider: dateProvider, lifetimeDuration: duration)
 
         #expect(expiringValue.value == value)
-        #expect(expiringValue.lifetimeRange.lowerBound.isApproximatelyEqual(to: date, absoluteTolerance: 0.01))
-        #expect(
-            expiringValue.lifetimeRange.upperBound.isApproximatelyEqual(to: date + duration, absoluteTolerance: 0.01)
-        )
+        #expect(expiringValue.lifetimeRange.lowerBound == now)
+        #expect(expiringValue.lifetimeRange.upperBound == now + duration)
     }