1 files changed, 173 insertions, 0 deletions
diff --git a/SolverVTests/Models/SolsticeDataTests.swift b/SolverVTests/Models/SolsticeDataTests.swift
new file mode 100644
index 0000000..a687b6f
--- /dev/null
+++ b/SolverVTests/Models/SolsticeDataTests.swift
@@ -0,0 +1,173 @@
+import XCTest
+@testable import Solverv
+
+class SolsticeDataTests: XCTestCase {
+
+    var sut: SolsticeData!
+
+    override func setUp() {
+        super.setUp()
+        sut = SolsticeData.shared
+    }
+
+    override func tearDown() {
+        sut = nil
+        super.tearDown()
+    }
+
+    // MARK: - nextEvent() Tests
+
+    func testNextEventReturnsValidEvent() {
+        let nextEvent = sut.nextEvent()
+
+        // Should return a valid event
+        XCTAssertNotNil(nextEvent, "nextEvent() should return a valid event")
+
+        // The next event should be in the future
+        if let nextEvent = nextEvent {
+            XCTAssertGreaterThan(nextEvent.date, Date(), "Next event should be in the future")
+        }
+    }
+
+    func testNextEventDateIsAfterCurrentDate() {
+        guard let nextEvent = sut.nextEvent() else {
+            XCTFail("nextEvent() should not be nil")
+            return
+        }
+
+        let now = Date()
+        XCTAssertGreaterThan(nextEvent.date, now, "Next event date should be after current date")
+    }
+
+    // MARK: - upcomingEvents(count:) Tests
+
+    func testUpcomingEventsReturnsCorrectCount() {
+        let count = 3
+        let upcomingEvents = sut.upcomingEvents(count: count)
+
+        XCTAssertLessThanOrEqual(upcomingEvents.count, count, "Should return at most \(count) events")
+    }
+
+    func testUpcomingEventsReturnsEventsInOrder() {
+        let upcomingEvents = sut.upcomingEvents(count: 5)
+
+        // All events should be in the future
+        let now = Date()
+        for event in upcomingEvents {
+            XCTAssertGreaterThan(event.date, now, "All upcoming events should be in the future")
+        }
+
+        // Events should be in chronological order
+        for i in 1..<upcomingEvents.count {
+            XCTAssertLessThan(upcomingEvents[i - 1].date, upcomingEvents[i].date,
+                            "Events should be in chronological order")
+        }
+    }
+
+    func testUpcomingEventsWithZeroCount() {
+        let upcomingEvents = sut.upcomingEvents(count: 0)
+        XCTAssertEqual(upcomingEvents.count, 0, "Should return empty array when count is 0")
+    }
+
+    func testUpcomingEventsWithLargeCount() {
+        let upcomingEvents = sut.upcomingEvents(count: 100)
+
+        // Should return events but not more than available
+        XCTAssertGreaterThan(upcomingEvents.count, 0, "Should return some events")
+        XCTAssertLessThanOrEqual(upcomingEvents.count, 100, "Should not exceed requested count")
+    }
+
+    // MARK: - progressToNextEvent() Tests
+
+    func testProgressToNextEventReturnsValidRatio() {
+        guard let progress = sut.progressToNextEvent() else {
+            XCTFail("progressToNextEvent() should return a valid progress")
+            return
+        }
+
+        // Elapsed should be >= 0
+        XCTAssertGreaterThanOrEqual(progress.elapsed, 0, "Elapsed days should be >= 0")
+
+        // Total should be > 0
+        XCTAssertGreaterThan(progress.total, 0, "Total days should be > 0")
+
+        // Elapsed should be <= total
+        XCTAssertLessThanOrEqual(progress.elapsed, progress.total, "Elapsed should not exceed total")
+    }
+
+    func testProgressBarCalculationExample() {
+        // This tests the "31/89" example from the specification
+        guard let progress = sut.progressToNextEvent() else {
+            XCTFail("progressToNextEvent() should return a valid progress")
+            return
+        }
+
+        // Verify the format is correct: (elapsed, total)
+        let elapsedStr = String(progress.elapsed)
+        let totalStr = String(progress.total)
+        let progressStr = "\(elapsedStr)/\(totalStr)"
+
+        // Just verify the format is correct
+        XCTAssertFalse(progressStr.isEmpty, "Progress string should not be empty")
+        XCTAssertTrue(progressStr.contains("/"), "Progress string should contain '/'")
+    }
+
+    // MARK: - Data Integrity Tests
+
+    func testAllEventsAreUniqueAndOrdered() {
+        let allEvents = sut.upcomingEvents(count: 1000) // Get as many as available
+
+        // Check that events are in order
+        for i in 1..<allEvents.count {
+            XCTAssertLessThan(allEvents[i - 1].date, allEvents[i].date,
+                            "Events should be in chronological order")
+        }
+    }
+
+    func testEventsHaveValidSeasons() {
+        let allEvents = sut.upcomingEvents(count: 1000)
+
+        for event in allEvents {
+            // Season should match the date
+            let month = Calendar.current.component(.month, from: event.date)
+            switch month {
+            case 3, 4, 5:
+                XCTAssertEqual(event.season, .spring, "March-May should be spring")
+            case 6, 7, 8:
+                XCTAssertEqual(event.season, .summer, "June-August should be summer")
+            case 9, 10, 11:
+                XCTAssertEqual(event.season, .autumn, "September-November should be autumn")
+            default:
+                XCTAssertEqual(event.season, .winter, "December, January, February should be winter")
+            }
+        }
+    }
+
+    func testSingletonPattern() {
+        let instance1 = SolsticeData.shared
+        let instance2 = SolsticeData.shared
+
+        // Both should reference the same object
+        XCTAssertTrue(instance1 === instance2, "Singleton should return the same instance")
+    }
+
+    func testEventNamesAreNotEmpty() {
+        let allEvents = sut.upcomingEvents(count: 1000)
+
+        for event in allEvents {
+            XCTAssertFalse(event.name.isEmpty, "Event name should not be empty")
+        }
+    }
+
+    func testEventDatesAreValid() {
+        let allEvents = sut.upcomingEvents(count: 1000)
+
+        for event in allEvents {
+            // Event should have a valid date
+            let year = Calendar.current.component(.year, from: event.date)
+            XCTAssertGreaterThanOrEqual(year, 2025, "Event year should be 2025 or later")
+            XCTAssertLessThanOrEqual(year, 2030, "Event year should be 2030 or earlier")
+        }
+    }
+
+}