Tests: recurring-task occurrence expansion (date mapping)

8 tests covering daily / weekly / every-weekday / monthly / yearly expansion,
repeat-until cutoff, time-of-day preservation on the mapped local day, and
non-recurring single-day placement. Uses Calendar.current so it holds in any
timezone. Closes the recurrence-coverage gap from the calendar fix.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

KisaniCal.xcodeproj/project.pbxproj

@@ -22,6 +22,7 @@
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@@ -132,6 +133,7 @@
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 		D44530A77DF12A17E52AAF34 /* MatrixView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MatrixView.swift; sourceTree = "<group>"; };
+		D72D757FA29923B6C150B5EE /* RecurrenceTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RecurrenceTests.swift; sourceTree = "<group>"; };
 		DCC2AFB4FA765383740767CB /* TaskItem.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TaskItem.swift; sourceTree = "<group>"; };
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@@ -146,6 +148,7 @@
 			isa = PBXGroup;
 			children = (
 				74FAA2B41FCEBC7E3F156F0F /* CalendarGridTests.swift */,
+				D72D757FA29923B6C150B5EE /* RecurrenceTests.swift */,
 			);
 			path = KisaniCalTests;
 			sourceTree = "<group>";
@@ -431,6 +434,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				6BCBF3902E38FBAA7348840D /* CalendarGridTests.swift in Sources */,
+				4FB79BBC1EE0F6C7EF844B02 /* RecurrenceTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

KisaniCalTests/RecurrenceTests.swift

@@ -0,0 +1,100 @@
+import XCTest
+@testable import KisaniCal
+
+/// Verifies recurring-task occurrence expansion maps to the correct real calendar
+/// days (the calendar's event-date mapping for tasks). Uses Calendar.current — the
+/// same calendar the production code uses — so assertions hold in any timezone.
+@MainActor
+final class RecurrenceTests: XCTestCase {
+
+    private let cal = Calendar.current
+
+    private func day(_ y: Int, _ m: Int, _ d: Int, h: Int = 0, min: Int = 0) -> Date {
+        cal.date(from: DateComponents(year: y, month: m, day: d, hour: h, minute: min))!
+    }
+
+    private func vm(with tasks: [TaskItem]) -> TaskViewModel {
+        let v = TaskViewModel()
+        v.tasks = tasks
+        return v
+    }
+
+    private func task(_ label: String, start: Date, hasTime: Bool = false, end: Date? = nil) -> TaskItem {
+        var t = TaskItem(title: "T-\(label)", dueDate: start)
+        t.isRecurring = true
+        t.recurrenceLabel = label
+        t.hasTime = hasTime
+        t.recurrenceEnd = end
+        return t
+    }
+
+    private func hasOccurrence(_ v: TaskViewModel, _ id: UUID, on date: Date) -> Bool {
+        v.occurrences(on: date).contains { $0.id == id }
+    }
+
+    func testDailyExpandsEveryDayFromStart() {
+        let t = task("Daily", start: day(2026, 6, 1))
+        let v = vm(with: [t])
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 5, 31)), "no occurrence before start")
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 1)))
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 24)))
+    }
+
+    func testWeeklyHitsEverySevenDaysOnly() {
+        let t = task("Weekly", start: day(2026, 6, 1)) // Monday
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 8)))
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 22)))
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 9)), "off-cadence day must not match")
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 24)))
+    }
+
+    func testEveryWeekdaySkipsWeekend() {
+        let t = task("Every Weekday", start: day(2026, 6, 1))
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 24)), "Wed is a weekday")
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 27)), "Sat excluded")
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 28)), "Sun excluded")
+    }
+
+    func testMonthlyMatchesDayOfMonth() {
+        let t = task("Monthly", start: day(2026, 1, 15))
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 15)))
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 16)))
+    }
+
+    func testYearlyMatchesMonthAndDay() {
+        let t = task("Yearly", start: day(2025, 6, 24))
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 24)))
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 23)))
+    }
+
+    func testRecurrenceEndStopsExpansion() {
+        let t = task("Daily", start: day(2026, 6, 1), end: day(2026, 6, 10))
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 10)), "inclusive of end day")
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 11)), "past repeat-until")
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 24)))
+    }
+
+    func testOccurrenceCopyPreservesTimeOnTargetLocalDay() {
+        let t = task("Daily", start: day(2026, 6, 1, h: 9, min: 30), hasTime: true)
+        let v = vm(with: [t])
+        let occ = v.occurrences(on: day(2026, 6, 24)).first { $0.id == t.id }
+        XCTAssertNotNil(occ)
+        XCTAssertTrue(cal.isDate(occ!.dueDate!, inSameDayAs: day(2026, 6, 24)), "mapped to June 24")
+        XCTAssertEqual(cal.component(.hour, from: occ!.dueDate!), 9)
+        XCTAssertEqual(cal.component(.minute, from: occ!.dueDate!), 30)
+    }
+
+    func testNonRecurringTaskAppearsOnlyOnItsDay() {
+        var t = TaskItem(title: "Dinner with Jay", dueDate: day(2026, 6, 24))
+        t.isRecurring = false
+        let v = vm(with: [t])
+        XCTAssertTrue(hasOccurrence(v, t.id, on: day(2026, 6, 24)))
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 23)))
+        XCTAssertFalse(hasOccurrence(v, t.id, on: day(2026, 6, 25)))
+    }
+}