test: add tests for AccountBalanceNotifier (#319)

Author: victoreronmosele

test/features/account/account_balance_notifier_test.dart

@@ -0,0 +1,154 @@
+import 'package:didpay/features/account/account_balance.dart';
+import 'package:didpay/features/account/account_balance_notifier.dart';
+import 'package:didpay/features/tbdex/tbdex_service.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:mocktail/mocktail.dart';
+
+import '../../helpers/mocks.dart';
+import '../../helpers/riverpod_helpers.dart';
+import '../../helpers/test_data.dart';
+
+Future<void> main() async {
+  await TestData.initializeDids();
+
+  final pfis = TestData.getPfis();
+  final did = TestData.aliceDid;
+
+  setUpAll(() {
+    registerFallbackValue(
+      const AsyncData<AccountBalance?>(null),
+    );
+  });
+
+  group('AccountBalanceNotifier', () {
+    group('fetchAccountBalance', () {
+      test('should return null if pfis is empty', () async {
+        final notifier = AccountBalanceNotifier();
+        final result = await notifier.fetchAccountBalance(did, []);
+        expect(result, null);
+      });
+
+      test('should return null if pfis is null', () async {
+        final notifier = AccountBalanceNotifier();
+        final result = await notifier.fetchAccountBalance(did, null);
+        expect(result, null);
+      });
+
+      test('should set state to AsyncValue.data(accountBalance) if successful',
+          () async {
+        final mockTbdexService = MockTbdexService();
+        final accountBalance = TestData.getAccountBalance();
+
+        when(
+          () => mockTbdexService.getAccountBalance(did, pfis),
+        ).thenAnswer((_) async => accountBalance);
+
+        final container = createContainer(
+          overrides: [
+            tbdexServiceProvider.overrideWith(
+              (ref) => mockTbdexService,
+            ),
+          ],
+        );
+
+        final listener = Listener<AsyncValue<void>>();
+
+        final accountBalanceNotifier =
+            container.read(accountBalanceProvider.notifier);
+
+        container.listen(accountBalanceProvider, listener.call);
+
+        await accountBalanceNotifier.fetchAccountBalance(did, pfis);
+
+        verify(
+          () => listener(
+            const AsyncLoading<AccountBalance?>(),
+            any(that: isA<AsyncData<AccountBalance?>>()),
+          ),
+        );
+      });
+
+      test('should return account balance if successful', () async {
+        final mockTbdexService = MockTbdexService();
+        final accountBalance = TestData.getAccountBalance();
+
+        when(
+          () => mockTbdexService.getAccountBalance(did, pfis),
+        ).thenAnswer((_) async => accountBalance);
+
+        final container = createContainer(
+          overrides: [
+            tbdexServiceProvider.overrideWith(
+              (ref) => mockTbdexService,
+            ),
+          ],
+        );
+
+        final accountBalanceNotifier =
+            container.read(accountBalanceProvider.notifier);
+
+        final result =
+            await accountBalanceNotifier.fetchAccountBalance(did, pfis);
+
+        expect(result, accountBalance);
+      });
+
+      test('should set state to AsyncValue.error when error occurs', () async {
+        final mockTbdexService = MockTbdexService();
+
+        when(
+          () => mockTbdexService.getAccountBalance(did, pfis),
+        ).thenThrow(Exception('Error fetching account balance'));
+
+        final container = createContainer(
+          overrides: [
+            tbdexServiceProvider.overrideWith(
+              (ref) => mockTbdexService,
+            ),
+          ],
+        );
+
+        final listener = Listener<AsyncValue<void>>();
+
+        final accountBalanceNotifier =
+            container.read(accountBalanceProvider.notifier);
+
+        container.listen(accountBalanceProvider, listener.call);
+
+        await accountBalanceNotifier.fetchAccountBalance(did, pfis);
+
+        verify(
+          () => listener(
+            const AsyncLoading<AccountBalance?>(),
+            any(that: isA<AsyncError>()),
+          ),
+        );
+      });
+
+      test('should return null when error occurs', () async {
+        final mockTbdexService = MockTbdexService();
+
+        when(
+          () => mockTbdexService.getAccountBalance(did, pfis),
+        ).thenThrow(Exception('Error fetching account balance'));
+
+        final container = createContainer(
+          overrides: [
+            tbdexServiceProvider.overrideWith(
+              (ref) => mockTbdexService,
+            ),
+          ],
+        );
+
+        final accountBalanceNotifier =
+            container.read(accountBalanceProvider.notifier);
+
+        final result =
+            await accountBalanceNotifier.fetchAccountBalance(did, pfis);
+
+        expect(result, null);
+      });
+    });
+  });
+}