feat: implement core notification functionality for iOS and Android - Add settings management, proper error handling, and platform-specific implementations

ios/Tests/DailyNotificationTests.swift

@@ -0,0 +1,29 @@
+import XCTest
+@testable import Plugin
+
+class DailyNotificationTests: XCTestCase {
+    var plugin: DailyNotificationPlugin!
+    
+    override func setUp() {
+        super.setUp()
+        plugin = DailyNotificationPlugin()
+    }
+    
+    func testTimeValidation() {
+        // Valid time
+        XCTAssertTrue(plugin.isValidTime("09:00"))
+        
+        // Invalid times
+        XCTAssertFalse(plugin.isValidTime("25:00"))
+        XCTAssertFalse(plugin.isValidTime("09:60"))
+        XCTAssertFalse(plugin.isValidTime("9:00"))
+        XCTAssertFalse(plugin.isValidTime("0900"))
+    }
+    
+    func testTimezoneValidation() {
+        XCTAssertTrue(plugin.isValidTimezone("America/New_York"))
+        XCTAssertFalse(plugin.isValidTimezone("Invalid/Timezone"))
+    }
+    
+    // Add more tests...
+}