social-app/apps/test/features/todo/quadrant_drag_test.dart

import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail/mocktail.dart';
import 'package:social_app/features/todo/data/todo_api.dart';
import 'package:social_app/core/api/i_api_client.dart';

class MockApiClient extends Mock implements IApiClient {}

class FakeRequestOptions extends Fake implements RequestOptions {}

void main() {
  late TodoApi todoApi;
  late MockApiClient mockClient;

  setUpAll(() {
    registerFallbackValue(FakeRequestOptions());
  });

  setUp(() {
    mockClient = MockApiClient();
    todoApi = TodoApi(mockClient);
  });

  group('TodoApi.updateTodo - cross-quadrant drag', () {
    test(
      'calls PATCH with priority when moving to different quadrant',
      () async {
        const todoId = 'todo-123';
        const targetPriority = 2;

        when(
          () => mockClient.patch(any(), data: any(named: 'data')),
        ).thenAnswer(
          (_) async => Response(
            requestOptions: RequestOptions(path: '/api/v1/todos/$todoId'),
            data: {
              'id': todoId,
              'owner_id': 'user-1',
              'title': 'Test Todo',
              'priority': targetPriority,
              'status': 'pending',
              'created_at': '2024-01-01T00:00:00Z',
              'updated_at': '2024-01-01T00:00:00Z',
            },
          ),
        );

        final result = await todoApi.updateTodo(
          todoId,
          priority: targetPriority,
        );

        expect(result.priority, targetPriority);
        verify(
          () => mockClient.patch(
            '/api/v1/todos/$todoId',
            data: {'priority': targetPriority},
          ),
        ).called(1);
      },
    );

    test('throws when API fails - triggers rollback', () async {
      const todoId = 'todo-123';

      when(
        () => mockClient.patch(any(), data: any(named: 'data')),
      ).thenThrow(Exception('Network error'));

      expect(() => todoApi.updateTodo(todoId, priority: 2), throwsException);
    });
  });

  group('Quadrant priority mapping', () {
    test('priority 1 = important urgent (Q1)', () async {
      when(() => mockClient.patch(any(), data: any(named: 'data'))).thenAnswer(
        (_) async => Response(
          requestOptions: RequestOptions(path: '/api/v1/todos/todo-1'),
          data: {
            'id': 'todo-1',
            'owner_id': 'user-1',
            'title': 'Q1 Todo',
            'priority': 1,
            'status': 'pending',
            'created_at': '2024-01-01T00:00:00Z',
            'updated_at': '2024-01-01T00:00:00Z',
          },
        ),
      );

      final result = await todoApi.updateTodo('todo-1', priority: 1);
      expect(result.priority, 1);
    });

    test('priority 2 = important not urgent (Q3)', () async {
      when(() => mockClient.patch(any(), data: any(named: 'data'))).thenAnswer(
        (_) async => Response(
          requestOptions: RequestOptions(path: '/api/v1/todos/todo-2'),
          data: {
            'id': 'todo-2',
            'owner_id': 'user-1',
            'title': 'Q3 Todo',
            'priority': 2,
            'status': 'pending',
            'created_at': '2024-01-01T00:00:00Z',
            'updated_at': '2024-01-01T00:00:00Z',
          },
        ),
      );

      final result = await todoApi.updateTodo('todo-2', priority: 2);
      expect(result.priority, 2);
    });

    test('priority 3 = urgent not important (Q2)', () async {
      when(() => mockClient.patch(any(), data: any(named: 'data'))).thenAnswer(
        (_) async => Response(
          requestOptions: RequestOptions(path: '/api/v1/todos/todo-3'),
          data: {
            'id': 'todo-3',
            'owner_id': 'user-1',
            'title': 'Q2 Todo',
            'priority': 3,
            'status': 'pending',
            'created_at': '2024-01-01T00:00:00Z',
            'updated_at': '2024-01-01T00:00:00Z',
          },
        ),
      );

      final result = await todoApi.updateTodo('todo-3', priority: 3);
      expect(result.priority, 3);
    });
  });
}