tm_app/test/view_models/auth_view_model_login_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:tm_app/core/utils/result.dart';
import 'package:tm_app/view_models/auth_view_model.dart';

import '../fixtures/test_fixtures.dart';
import '../mocks/mock_auth_repository.dart';

void main() {
  group('AuthViewModel Login', () {
    late MockAuthRepository mockRepository;
    late AuthViewModel authViewModel;

    setUp(() {
      mockRepository = MockAuthRepository();
      authViewModel = AuthViewModel(authRepository: mockRepository);
    });

    tearDown(() {
      authViewModel.dispose();
    });

    test('should login successfully', () async {
      mockRepository.setLoginResult(
        const Result.ok(TestFixtures.loginResponse),
      );

      authViewModel.usernameController.text = 'testuser';
      authViewModel.passwordController.text = 'testpass';

      await authViewModel.login();

      expect(authViewModel.isLoading, false);
      expect(authViewModel.loggedInUser, TestFixtures.customer);
      expect(authViewModel.usernameController.text, isEmpty);
      expect(authViewModel.passwordController.text, isEmpty);
      expect(authViewModel.errorMessage, null);
    });

    test('should handle login error', () async {
      const errorMessage = 'Invalid credentials';
      mockRepository.setLoginResult(Result.error(Exception(errorMessage)));

      authViewModel.usernameController.text = 'testuser';
      authViewModel.passwordController.text = 'wrongpass';

      await authViewModel.login();

      expect(authViewModel.isLoading, false);
      expect(authViewModel.loggedInUser, null);
      expect(authViewModel.errorMessage, null); // Cleared after notify
    });

    test('should set loading state during login', () async {
      mockRepository.setLoginResult(
        const Result.ok(TestFixtures.loginResponse),
      );

      authViewModel.usernameController.text = 'testuser';
      authViewModel.passwordController.text = 'testpass';

      final loginFuture = authViewModel.login();

      // Check loading state is set
      expect(authViewModel.isLoading, true);
      expect(authViewModel.errorMessage, null);

      await loginFuture;

      expect(authViewModel.isLoading, false);
    });

    test('should call localLogout before login', () async {
      mockRepository.setLoginResult(
        const Result.ok(TestFixtures.loginResponse),
      );

      authViewModel.usernameController.text = 'testuser';
      authViewModel.passwordController.text = 'testpass';

      await authViewModel.login();

      // Verify that localLogout was called (user is null initially)
      expect(authViewModel.loggedInUser, TestFixtures.customer);
    });
  });
}