Create Task class + tests

lib/models/task.dart

@@ -0,0 +1,41 @@
+/// Represents a task or topic the user wants to discuss with the agent.
+class Task {
+  final int id;
+  String _title;
+
+  Task({required this.id, required String title})
+      : assert(title.isNotEmpty, 'Title cannot be empty'),
+        _title = title;
+
+  String get title => _title;
+
+  set title(String newTitle) {
+    if (newTitle.isNotEmpty) {
+      _title = newTitle;
+    } else {
+      throw ArgumentError('Title cannot be empty.');
+    }
+  }
+
+  // Convert a Map (usually from JSON) to a Task object
+  factory Task.fromMap(Map<String, dynamic> map) {
+    return Task(
+      id: map['id'],
+      title: map['title'],
+    );
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is Task &&
+          runtimeType == other.runtimeType &&
+          id == other.id &&
+          title == other.title;
+
+  @override
+  int get hashCode => id.hashCode ^ title.hashCode;
+
+  @override
+  String toString() => 'Task(id: $id, title: $title)';
+}

test/task_test.dart

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+import 'package:auto_gpt_flutter_client/models/task.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Task', () {
+    // Test the properties of the Task class
+    test('Task properties', () {
+      final task = Task(id: 1, title: 'Test Task');
+
+      expect(task.id, 1);
+      expect(task.title, 'Test Task');
+    });
+
+    // Test Task.fromMap method
+    test('Task.fromMap', () {
+      final task = Task.fromMap({'id': 1, 'title': 'Test Task'});
+
+      expect(task.id, 1);
+      expect(task.title, 'Test Task');
+    });
+
+    // Test creating a Task with an empty title
+    test('Task with empty title', () {
+      expect(() => Task(id: 2, title: ''), throwsA(isA<AssertionError>()));
+    });
+
+    // Test that two Task objects with the same id and title are equal
+    test('Two tasks with same properties are equal', () {
+      final task1 = Task(id: 4, title: 'Same Task');
+      final task2 = Task(id: 4, title: 'Same Task');
+
+      expect(task1, task2);
+    });
+
+    // Test that toString() returns a string representation of the Task
+    test('toString returns string representation', () {
+      final task = Task(id: 5, title: 'Test toString');
+
+      expect(task.toString(), 'Task(id: 5, title: Test toString)');
+    });
+
+    // Test that title of Task can be modified
+    test('Modify task title', () {
+      final task = Task(id: 6, title: 'Initial Title');
+      task.title = 'Modified Title';
+
+      expect(task.title, 'Modified Title');
+    });
+
+    // Test that setting an empty title throws an error
+    test('Set empty title', () {
+      final task = Task(id: 7, title: 'Valid Title');
+
+      expect(() => task.title = '', throwsA(isA<ArgumentError>()));
+    });
+  });
+}