test: add tests for daily challenge card

Author: huyenltnguyen

mobile-app/lib/ui/views/learn/widgets/daily_challenge_card.dart

@@ -30,6 +30,8 @@ class _DailyChallengeCardState extends State<DailyChallengeCard> {
   bool _isCompleted = false;
   final AuthenticationService _auth = locator<AuthenticationService>();
   final NavigationService _navigationService = locator<NavigationService>();
+  final DailyChallengeService _dailyChallengeService =
+      locator<DailyChallengeService>();
 
   void _navigateToDailyChallenge(BuildContext context) {
     if (_challenge == null) return;
@@ -76,8 +78,7 @@ class _DailyChallengeCardState extends State<DailyChallengeCard> {
       _error = null;
     });
     try {
-      final todayChallenge =
-          await DailyChallengeService().fetchTodayChallenge();
+      final todayChallenge = await _dailyChallengeService.fetchTodayChallenge();
 
       final isCompleted = await _checkIfChallengeCompleted(todayChallenge.id);
 
@@ -301,7 +302,7 @@ class _DailyChallengeCardState extends State<DailyChallengeCard> {
                 borderRadius: BorderRadius.all(Radius.circular(16)),
                 boxShadow: [
                   BoxShadow(
-                    color: Colors.black.withValues(alpha: 0.10),
+                    color: Colors.black.withOpacity(0.10),
                     blurRadius: 16,
                     offset: Offset(0, 8),
                   ),

mobile-app/test/helpers/test_helpers.dart

@@ -1,4 +1,6 @@
 import 'package:freecodecamp/app/app.locator.dart';
+import 'package:freecodecamp/service/authentication/authentication_service.dart';
+import 'package:freecodecamp/service/learn/daily_challenge_service.dart';
 import 'package:freecodecamp/service/news/bookmark_service.dart';
 import 'package:mockito/annotations.dart';
 import 'package:stacked_services/stacked_services.dart';
@@ -9,12 +11,16 @@ import 'test_helpers.mocks.dart';
 @GenerateMocks([], customMocks: [
   MockSpec<NavigationService>(onMissingStub: OnMissingStub.returnDefault),
   MockSpec<DialogService>(onMissingStub: OnMissingStub.returnDefault),
+  MockSpec<DailyChallengeService>(onMissingStub: OnMissingStub.returnDefault),
+  MockSpec<AuthenticationService>(onMissingStub: OnMissingStub.returnDefault),
 // @stacked-mock-spec
 ])
 void registerServices() {
   getAndRegisterNavigationService();
   getAndRegisterDialogService();
   getAndRegisterNewsBookmarkService();
+  getAndRegisterDailyChallengeService();
+  getAndRegisterAuthenticationService();
 // @stacked-mock-register
 }
 
@@ -38,6 +44,20 @@ BookmarksDatabaseService getAndRegisterNewsBookmarkService() {
   locator.registerSingleton<BookmarksDatabaseService>(service);
   return service;
 }
+
+MockDailyChallengeService getAndRegisterDailyChallengeService() {
+  _removeRegistrationIfExists<DailyChallengeService>();
+  final service = MockDailyChallengeService();
+  locator.registerSingleton<DailyChallengeService>(service);
+  return service;
+}
+
+MockAuthenticationService getAndRegisterAuthenticationService() {
+  _removeRegistrationIfExists<AuthenticationService>();
+  final service = MockAuthenticationService();
+  locator.registerSingleton<AuthenticationService>(service);
+  return service;
+}
 // @stacked-mock-create
 
 void _removeRegistrationIfExists<T extends Object>() {