Add frontend subdirectory to project

frontend/test/task_viewmodel_test.dart

@@ -0,0 +1,76 @@
+import 'package:auto_gpt_flutter_client/viewmodels/task_viewmodel.dart';
+import 'package:auto_gpt_flutter_client/viewmodels/mock_data.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('TaskViewModel', () {
+    late TaskViewModel viewModel;
+
+    setUp(() {
+      viewModel = TaskViewModel();
+    });
+
+    test('Fetches tasks successfully', () {
+      viewModel.fetchTasks();
+      expect(viewModel.tasks, isNotEmpty);
+    });
+
+    test('Selects a task successfully', () {
+      viewModel.fetchTasks();
+      viewModel.selectTask(1);
+      expect(viewModel.selectedTask, isNotNull);
+    });
+
+    test(
+        'Notifiers are properly telling UI to update after fetching a task or selecting a task',
+        () {
+      bool hasNotified = false;
+      viewModel.addListener(() {
+        hasNotified = true;
+      });
+
+      viewModel.fetchTasks();
+      expect(hasNotified, true);
+
+      hasNotified = false; // Reset for next test
+      viewModel.selectTask(1);
+      expect(hasNotified, true);
+    });
+
+    test('No tasks are fetched', () {
+      // Clear mock data for this test
+      mockTasks.clear();
+
+      viewModel.fetchTasks();
+      expect(viewModel.tasks, isEmpty);
+    });
+
+    test('No task is selected', () {
+      expect(viewModel.selectedTask, isNull);
+    });
+
+    test('Creates a task successfully', () {
+      final initialCount = viewModel.tasks.length;
+      viewModel.createTask('New Task');
+      expect(viewModel.tasks.length, initialCount + 1);
+    });
+
+    test('Deletes a task successfully', () {
+      viewModel.fetchTasks();
+      final initialCount = viewModel.tasks.length;
+      viewModel.deleteTask(1);
+      expect(viewModel.tasks.length, initialCount - 1);
+    });
+
+    test('Deletes a task with invalid id', () {
+      // TODO: Update this test to expect an error once we have TaskService implemented
+      final initialCount = viewModel.tasks.length;
+      viewModel.deleteTask(9999); // Assuming no task with this id exists
+      expect(viewModel.tasks.length, initialCount); // Count remains same
+    });
+
+    test('Select a task that doesn\'t exist', () {
+      expect(() => viewModel.selectTask(9999), throwsA(isA<ArgumentError>()));
+    });
+  });
+}