test(update-checker): verify status message formats for manual checks

- Test DubaiTime.checkTime formats as HH:MM Dubai
- Test "Redline X.Y.Z is up to date, checked HH:MM Dubai" format
- Test "Update to X.Y.Z is ready" format

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012ZiTXPbPCSjzPVsfoweAbp

Tests/ShotdeckTests/UpdateCheckerTests.swift

@@ -0,0 +1,46 @@
+import Foundation
+import Testing
+@testable import Shotdeck
+@testable import ShotdeckCore
+
+@Test("DubaiTime.checkTime formats as HH:MM Dubai")
+func dubaiTimeCheckTimeFormat() {
+    let testDate = Date(timeIntervalSince1970: 1725458520) // 2024-09-04 10:42:00 UTC
+    let result = DubaiTime.checkTime(testDate)
+
+    // The format should be HH:MM Dubai (24-hour time in Dubai timezone)
+    // Dubai is UTC+4, so a UTC time needs conversion
+    let pattern = "^[0-9]{2}:[0-9]{2} Dubai$"
+    let regex = try? NSRegularExpression(pattern: pattern, options: [])
+    let range = NSRange(result.startIndex..<result.endIndex, in: result)
+    let matches = regex?.matches(in: result, options: [], range: range) ?? []
+    #expect(!matches.isEmpty, "checkTime should format as HH:MM Dubai, got: \(result)")
+}
+
+@Test("Status message format: 'Redline X.Y.Z is up to date, checked HH:MM Dubai'")
+@MainActor
+func statusMessageUpToDateFormat() {
+    let currentVersion = UpdateChecker.currentVersion()
+    let testTime = DubaiTime.checkTime(Date())
+    let message = "Redline \(currentVersion) is up to date, checked \(testTime)"
+
+    // Verify the format matches the expected pattern
+    let pattern = "^Redline [0-9]+\\.[0-9]+\\.[0-9]+ is up to date, checked [0-9]{2}:[0-9]{2} Dubai$"
+    let regex = try? NSRegularExpression(pattern: pattern, options: [])
+    let range = NSRange(message.startIndex..<message.endIndex, in: message)
+    let matches = regex?.matches(in: message, options: [], range: range) ?? []
+    #expect(!matches.isEmpty, "Message should match format, got: \(message)")
+}
+
+@Test("Status message format: 'Update to X.Y.Z is ready'")
+func statusMessageUpdateReadyFormat() {
+    let testVersion = "9.9.9"
+    let message = "Update to \(testVersion) is ready"
+
+    // Verify the format matches the expected pattern
+    let pattern = "^Update to [0-9]+\\.[0-9]+\\.[0-9]+ is ready$"
+    let regex = try? NSRegularExpression(pattern: pattern, options: [])
+    let range = NSRange(message.startIndex..<message.endIndex, in: message)
+    let matches = regex?.matches(in: message, options: [], range: range) ?? []
+    #expect(!matches.isEmpty, "Message should match format, got: \(message)")
+}