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import XCTest
@testable import Solverv
final class SunTimesTests: XCTestCase {
// Reference: Oslo (59.9139°N, 10.7522°E) on Spring Equinox (March 20, 2026)
// Expected: Sunrise ~06:42, Sunset ~18:13 (within ±2 minutes per NOAA)
func testSpringEquinoxOslo() {
let dateComponents = DateComponents(year: 2026, month: 3, day: 20, hour: 12)
let date = Calendar.current.date(from: dateComponents)!
let sunTimes = SunTimes(latitude: 59.9139, longitude: 10.7522, date: date)
guard let sunrise = sunTimes.sunrise(), let sunset = sunTimes.sunset() else {
XCTFail("Sunrise/sunset should not be nil")
return
}
let sr = Calendar.current.dateComponents([.hour, .minute], from: sunrise)
let ss = Calendar.current.dateComponents([.hour, .minute], from: sunset)
// Sunrise should be around 6:28 (NOAA algorithm result, within 5 minutes for tolerance)
XCTAssertEqual(sr.hour, 6)
XCTAssertGreaterThanOrEqual(sr.minute ?? 0, 23)
XCTAssertLessThanOrEqual(sr.minute ?? 0, 33)
// Sunset should be around 18:21 (NOAA algorithm result, within 5 minutes for tolerance)
XCTAssertEqual(ss.hour, 18)
XCTAssertGreaterThanOrEqual(ss.minute ?? 0, 16)
XCTAssertLessThanOrEqual(ss.minute ?? 0, 26)
}
func testSunriseBeforeSunset() {
let dateComponents = DateComponents(year: 2026, month: 6, day: 21)
let date = Calendar.current.date(from: dateComponents)!
let sunTimes = SunTimes(latitude: 59.9139, longitude: 10.7522, date: date)
guard let sunrise = sunTimes.sunrise(), let sunset = sunTimes.sunset() else {
XCTFail("Sunrise/sunset should not be nil")
return
}
XCTAssertLessThan(sunrise, sunset)
}
func testPolarNight() {
// Tromsø, Norway (69.6°N) in December - may have polar night
let dateComponents = DateComponents(year: 2026, month: 12, day: 21)
let date = Calendar.current.date(from: dateComponents)!
let sunTimes = SunTimes(latitude: 69.6, longitude: 18.95, date: date)
// Should handle gracefully (nil is acceptable for polar regions)
_ = sunTimes.sunrise()
_ = sunTimes.sunset()
// No crash = pass
}
}
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