test: add tests for daily challenge card

mobile-app/test/widget/daily_challenge_card_test.dart

@@ -0,0 +1,213 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:freecodecamp/app/app.locator.dart';
+import 'package:freecodecamp/app/app.router.dart';
+import 'package:freecodecamp/models/learn/daily_challenge_model.dart';
+import 'package:freecodecamp/ui/views/learn/widgets/daily_challenge_card.dart';
+import 'package:mockito/mockito.dart';
+import 'package:timezone/data/latest.dart' as tzdata;
+
+import '../helpers/test_helpers.dart';
+import '../helpers/test_helpers.mocks.dart';
+
+void main() {
+  // Mock service variables
+  late MockNavigationService mockNavigationService;
+
+  // Test data
+  final testChallenge = DailyChallenge(
+    id: 'test-challenge-id',
+    challengeNumber: 1,
+    date: DateTime(2025, 7, 26),
+    title: 'Test Daily Challenge',
+    description: 'A test challenge description',
+    javascript: DailyChallengeLanguageData(
+      tests: [],
+      challengeFiles: [],
+    ),
+    python: DailyChallengeLanguageData(
+      tests: [],
+      challengeFiles: [],
+    ),
+  );
+
+  setUp(() {
+    TestWidgetsFlutterBinding.ensureInitialized();
+    tzdata.initializeTimeZones();
+
+    // Register services
+    registerServices();
+    mockNavigationService = getAndRegisterNavigationService();
+  });
+
+  tearDown(() {
+    locator.reset();
+  });
+
+  Widget createTestWidget({
+    DailyChallenge? challenge,
+    bool isCompleted = false,
+  }) {
+    return MaterialApp(
+      home: Scaffold(
+        body: DailyChallengeCard(
+          dailyChallenge: challenge,
+          isCompleted: isCompleted,
+        ),
+      ),
+      onGenerateRoute: (settings) {
+        // Handle navigation routes used by the widget
+        if (settings.name == '/challenge-template-view') {
+          return MaterialPageRoute(
+            builder: (context) => Scaffold(
+              body: Center(child: Text('Challenge Template View')),
+            ),
+          );
+        }
+        return null;
+      },
+    );
+  }
+
+  testWidgets('should return empty widget when no challenge is provided',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget());
+
+    expect(find.byType(DailyChallengeCard), findsOneWidget);
+    expect(find.text('Today\'s challenge'), findsNothing);
+    expect(find.text('Start the challenge'), findsNothing);
+  });
+
+  testWidgets(
+      'should show challenge details when challenge is provided and not completed',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: false,
+    ));
+
+    expect(find.text('Today\'s challenge'), findsOneWidget);
+    expect(find.text('Test Daily Challenge'), findsOneWidget);
+    expect(find.text('Do you have the skills to complete this challenge?'),
+        findsOneWidget);
+    expect(find.text('Start the challenge'), findsOneWidget);
+    expect(find.byIcon(Icons.arrow_forward_ios), findsOneWidget);
+
+    // Test navigation to the challenge
+    await tester.tap(find.text('Start the challenge'));
+    await tester.pumpAndSettle();
+    expect(find.text('Challenge Template View'), findsOneWidget);
+  });
+
+  testWidgets(
+      'should show completed state with timer and allow navigation to past challenges',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: true,
+    ));
+
+    expect(find.text('Today\'s challenge completed!'), findsOneWidget);
+    expect(find.textContaining('Next challenge in:'), findsOneWidget);
+    expect(find.text('View past challenges'), findsOneWidget);
+    expect(find.byIcon(Icons.history), findsOneWidget);
+
+    final timerRegex = RegExp(r'^Next challenge in: \d{2}:\d{2}:\d{2}$');
+    final timerFinder = find.byWidgetPredicate((widget) {
+      if (widget is Text) {
+        return timerRegex.hasMatch(widget.data ?? '');
+      }
+      return false;
+    });
+    expect(timerFinder, findsOneWidget);
+
+    // Test navigation to past challenges
+    await tester.tap(find.text('View past challenges'));
+    await tester.pumpAndSettle();
+    verify(mockNavigationService.navigateTo(Routes.dailyChallengeView))
+        .called(1);
+  });
+
+  testWidgets(
+      'should have proper accessibility semantics for not completed state',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: false,
+    ));
+
+    final cardSemanticsFinder = find.byElementPredicate((element) {
+      return element.widget is Semantics &&
+          (element.widget as Semantics).properties.label ==
+              'Daily challenge card';
+    });
+
+    final buttonSemanticsFinder = find.byElementPredicate((element) {
+      return element.widget is Semantics &&
+          (element.widget as Semantics).properties.label == 'Go to challenge';
+    });
+
+    expect(cardSemanticsFinder, findsOneWidget);
+    expect(buttonSemanticsFinder, findsOneWidget);
+  });
+
+  testWidgets('should have proper accessibility semantics for completed state',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: true,
+    ));
+
+    final cardSemanticsFinder = find.byElementPredicate((element) {
+      return element.widget is Semantics &&
+          (element.widget as Semantics).properties.label ==
+              'Daily challenge completed. View past challenges.';
+    });
+
+    expect(cardSemanticsFinder, findsOneWidget);
+  });
+
+  testWidgets('should have live region semantics for timer in completed state',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: true,
+    ));
+
+    final semanticsWidgets =
+        tester.widgetList<Semantics>(find.byType(Semantics));
+    bool hasLiveRegion = false;
+
+    for (final semantics in semanticsWidgets) {
+      if (semantics.properties.liveRegion == true) {
+        hasLiveRegion = true;
+        break;
+      }
+    }
+
+    expect(hasLiveRegion, isTrue,
+        reason: 'Expected to find a Semantics widget with liveRegion: true');
+  });
+
+  testWidgets('should display countdown timer in completed state',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(createTestWidget(
+      challenge: testChallenge,
+      isCompleted: true,
+    ));
+
+    final timerRegex = RegExp(r'^Next challenge in: \d{2}:\d{2}:\d{2}$');
+    final timerFinder = find.byWidgetPredicate((widget) {
+      if (widget is Text) {
+        return timerRegex.hasMatch(widget.data ?? '');
+      }
+      return false;
+    });
+
+    expect(timerFinder, findsOneWidget);
+
+    // Check that timer text contains expected format
+    final timerWidget = tester.widget<Text>(timerFinder);
+    expect(timerWidget.data, matches(timerRegex));
+  });
+}