diff --git a/.github/workflows/flutter-ci.yml b/.github/workflows/flutter-ci.yml
index 54d835a..5e310c8 100644
--- a/.github/workflows/flutter-ci.yml
+++ b/.github/workflows/flutter-ci.yml
@@ -26,6 +26,10 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           flutter-version: "3.35.2"
+      - name: Install Linux dependencies
+        run: sudo apt-get update && sudo apt-get install -y clang cmake ninja-build pkg-config libgtk-3-dev
+      - name: Install Xvfb
+        run: sudo apt-get install -y xvfb
       - run: flutter pub get
       - run: |
           if [ -d "test" ]; then
@@ -33,6 +37,12 @@ jobs:
           else
             echo "No tests found, skipping..."
           fi
+      - run: |
+          if [ -d "integration_test" ]; then
+            xvfb-run -s '-screen 0 1024x768x24' flutter test integration_test -d linux
+          else
+            echo "No integration tests found, skipping..."
+          fi
 
   build:
     name: Build
diff --git a/integration_test/app_flow_test.dart b/integration_test/app_flow_test.dart
new file mode 100644
index 0000000..b796350
--- /dev/null
+++ b/integration_test/app_flow_test.dart
@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:flutterproject/main.dart' as app;
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  testWidgets('login then create task', (WidgetTester tester) async {
+    app.main();
+
+    // wait for splash screen to navigate to login
+    await tester.pumpAndSettle(const Duration(seconds: 4));
+
+    // fill login form
+    await tester.enterText(
+        find.byType(TextFormField).at(0), 'admin@todolist.com');
+    await tester.enterText(
+        find.byType(TextFormField).at(1), '123456');
+    await tester.tap(find.text('Se connecter'));
+    await tester.pumpAndSettle();
+
+    // wait for tasks to load
+    await tester.pump(const Duration(seconds: 2));
+    await tester.pumpAndSettle();
+
+    // open form
+    await tester.tap(find.text('Nouvelle tâche'));
+    await tester.pumpAndSettle();
+
+    // create task
+    await tester.enterText(
+        find.byType(TextFormField).first, 'Tâche intégration');
+    await tester.tap(find.text('Créer'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Tâche intégration'), findsOneWidget);
+  });
+}
diff --git a/pubspec.yaml b/pubspec.yaml
index 89a2309..58d2b10 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -45,6 +45,8 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  integration_test:
+    sdk: flutter
 
   # The "flutter_lints" package below contains a set of recommended lints to
   # encourage good coding practices. The lint set provided by the package is
diff --git a/test/auth_service_test.dart b/test/auth_service_test.dart
new file mode 100644
index 0000000..7007834
--- /dev/null
+++ b/test/auth_service_test.dart
@@ -0,0 +1,30 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutterproject/features/auth/data/auth_service.dart';
+
+void main() {
+  late AuthService service;
+
+  setUp(() {
+    service = AuthService();
+  });
+
+  test('login succeeds with valid credentials', () async {
+    final result = await service.login('admin@todolist.com', '123456');
+    expect(result.success, isTrue);
+    expect(service.isLoggedIn, isTrue);
+    expect(service.currentUserEmail, 'admin@todolist.com');
+  });
+
+  test('login fails with invalid credentials', () async {
+    final result = await service.login('wrong@example.com', 'bad');
+    expect(result.success, isFalse);
+    expect(service.isLoggedIn, isFalse);
+  });
+
+  test('logout resets state', () async {
+    await service.login('admin@todolist.com', '123456');
+    await service.logout();
+    expect(service.isLoggedIn, isFalse);
+    expect(service.currentUserEmail, isNull);
+  });
+}
diff --git a/test/task_list_widget_test.dart b/test/task_list_widget_test.dart
new file mode 100644
index 0000000..bc87c7c
--- /dev/null
+++ b/test/task_list_widget_test.dart
@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+import 'package:flutterproject/features/tasks/domain/models/task.dart';
+import 'package:flutterproject/features/tasks/presentation/providers/task_provider.dart';
+
+class _TaskList extends StatelessWidget {
+  const _TaskList();
+
+  @override
+  Widget build(BuildContext context) {
+    final tasks = context.watch<TaskProvider>().allTasks;
+    return ListView(
+      children: tasks.map((t) => Text(t.title)).toList(),
+    );
+  }
+}
+
+void main() {
+  testWidgets('displays tasks from provider', (WidgetTester tester) async {
+    final provider = TaskProvider();
+    provider.addTask(Task(id: '1', title: 'Test 1', createdAt: DateTime.now()));
+    provider.addTask(Task(id: '2', title: 'Test 2', createdAt: DateTime.now()));
+
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: provider,
+        child: const MaterialApp(home: Scaffold(body: _TaskList())),
+      ),
+    );
+
+    expect(find.text('Test 1'), findsOneWidget);
+    expect(find.text('Test 2'), findsOneWidget);
+  });
+}
diff --git a/test/task_modal_test.dart b/test/task_modal_test.dart
new file mode 100644
index 0000000..4fa74f4
--- /dev/null
+++ b/test/task_modal_test.dart
@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+import 'package:flutterproject/features/tasks/presentation/providers/task_provider.dart';
+import 'package:flutterproject/features/tasks/presentation/widgets/task_modal.dart';
+
+void main() {
+  testWidgets('TaskModal validates empty title', (WidgetTester tester) async {
+    tester.binding.window.physicalSizeTestValue = const Size(800, 1200);
+    tester.binding.window.devicePixelRatioTestValue = 1.0;
+    addTearDown(tester.binding.window.clearPhysicalSizeTestValue);
+    addTearDown(tester.binding.window.clearDevicePixelRatioTestValue);
+
+    await tester.pumpWidget(
+      ChangeNotifierProvider(
+        create: (_) => TaskProvider(),
+        child: const MaterialApp(home: Scaffold(body: TaskModal())),
+      ),
+    );
+
+    await tester.ensureVisible(find.text('Créer'));
+    await tester.tap(find.text('Créer'));
+    await tester.pump();
+
+    expect(find.text('Le titre est obligatoire'), findsOneWidget);
+  });
+}
diff --git a/test/task_model_test.dart b/test/task_model_test.dart
new file mode 100644
index 0000000..13c3d54
--- /dev/null
+++ b/test/task_model_test.dart
@@ -0,0 +1,22 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:flutterproject/features/tasks/domain/models/task.dart';
+import 'package:flutterproject/features/tasks/presentation/providers/task_provider.dart';
+
+void main() {
+  test('toggleCompleted switches the completion state', () {
+    final task = Task(
+      id: '1',
+      title: 'Demo',
+      createdAt: DateTime(2024, 1, 1),
+      isCompleted: false,
+    );
+    final toggled = task.toggleCompleted();
+    expect(toggled.isCompleted, isTrue);
+    expect(task.isCompleted, isFalse);
+  });
+
+  test('TaskStats calculates completion rate', () {
+    const stats = TaskStats(total: 4, completed: 1, pending: 3, highPriority: 0);
+    expect(stats.completionRate, closeTo(0.25, 0.001));
+  });
+}