povider_override_problem_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';

part 'fake_test.g.dart';

@riverpod
class TheNumber extends _$TheNumber {
  @override
  int build() {
    return 42;
  }
}

class TheNumberWidget extends ConsumerWidget {
  const TheNumberWidget({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final theNumber = ref.watch(theNumberProvider);

    return Text('TheNumber: $theNumber');
  }
}

@riverpod
class FakeNumber extends _$FakeNumber {
  @override
  int build() {
    return 43;
  }
}

void main() {
  group(
    'TheNumber Tests',
    () {
      testWidgets(
        'Testing TheNumber',
        (tester) async {
          await tester.pumpWidget(
            ProviderScope(
              overrides: [
                theNumberProvider.overrideWith(
                  (ref) {
                    return FakeNumber();
                  },
                ),
              ],
              child: MaterialApp(
                home: Scaffold(
                  body: Consumer(
                    builder: (context, ref, _) {
                      return Stack(
                        children: const [
                          Positioned(
                            top: 0,
                            left: 0,
                            child: TheNumberWidget(),
                          ),
                        ],
                      );
                    },
                  ),
                ),
              ),
            ),
          );

          await tester.pumpAndSettle();
          expect(find.text('TheNumber: 43'), findsOneWidget, reason: 'TheNumber should be 43');
        },
      );
    },
  );
}