This gist is to represent unexpected behaviour when testing FutureProvider in Riverpod 2.1.3

riverpod_future_provider_test.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';

void main() {
  group('RiverpodFutureProviders', () {
    // this fails - async is returned
    testWidgets('Future.value works', (tester) async {
      await tester.pumpRiverpodFutureProviders(Future.value('hello'));
      expect(find.text('hello'), findsOneWidget);
    });

    // this works
    testWidgets('just value works', (tester) async {
      await tester.pumpRiverpodFutureProviders('hello');
      expect(find.text('hello'), findsOneWidget);
    });

    //this works
    testWidgets('loading works', (tester) async {
      await tester.pumpRiverpodFutureProviders(Future.any([]));
      expect(find.text('loading'), findsOneWidget);
    });

    // this fails - async is returned
    testWidgets('error works', (tester) async {
      await tester.pumpRiverpodFutureProviders(Future.error('foo'));
      await tester.pumpAndSettle();
      expect(find.text('foo'), findsOneWidget);
    });

    // this works
    testWidgets('delayed error works', (tester) async {
      await tester.pumpRiverpodFutureProviders(
        Future.delayed(
          const Duration(milliseconds: 100),
          () => throw 'foo',
        ),
      );
      await tester.pumpAndSettle();
      expect(find.text('foo'), findsOneWidget);
    });
  });
}

final asyncDataProvider = FutureProvider((ref) => 'data');

extension on WidgetTester {
  Future<void> pumpRiverpodFutureProviders(FutureOr<String> future) =>
      pumpWidget(
        ProviderScope(
          overrides: [
            asyncDataProvider.overrideWith((ref) => future),
          ],
          child: MaterialApp(
            home: Scaffold(
              body: Consumer(
                builder: (context, ref, child) {
                  final snapshot = ref.watch(asyncDataProvider);
                  print(snapshot);
                  return snapshot.map(
                    data: (data) => Text(data.value),
                    error: (error) => Text(error.error.toString()),
                    loading: (loading) => const Text('loading'),
                  );
                },
              ),
            ),
          ),
        ),
      );
}