test(nutrition): update MealWidget test with nutrition provider stub

- Update MealWidget constructor call
- Add interaction steps to reveal ingredients section before testing the add button

Author: pankaj-basnet

test/nutrition/meal_test.dart

@@ -22,8 +22,16 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:wger/l10n/generated/app_localizations.dart';
 import 'package:wger/models/nutrition/meal.dart';
 import 'package:wger/providers/network_provider.dart';
+import 'package:wger/providers/nutrition_notifier.dart';
 import 'package:wger/widgets/nutrition/meal.dart';
 
+class _StubNutritionNotifier extends NutritionNotifier {
+  @override
+  Stream<NutritionState> build() async* {
+    yield const NutritionState();
+  }
+}
+
 void main() {
   Meal buildMeal() => Meal(
     id: 'aa000000-0000-4000-8000-000000000001',
@@ -37,13 +45,16 @@ void main() {
       // The meal widget does not gate its actions on connectivity. Pinning the
       // network status to offline makes a re-introduced connectivity gate fail
       // this test.
-      overrides: [networkStatusProvider.overrideWithValue(isOnline)],
+      overrides: [
+        networkStatusProvider.overrideWithValue(isOnline),
+        nutritionProvider.overrideWith(() => _StubNutritionNotifier()),
+      ],
       child: MaterialApp(
         localizationsDelegates: AppLocalizations.localizationsDelegates,
         supportedLocales: AppLocalizations.supportedLocales,
         home: Scaffold(
           body: SingleChildScrollView(
-            child: MealWidget(buildMeal(), const [], false, false),
+            child: MealWidget(buildMeal(), false, false),
           ),
         ),
       ),
@@ -60,12 +71,18 @@ void main() {
     await tester.tap(find.byIcon(Icons.edit));
     await tester.pumpAndSettle();
 
+    // Reveal the ingredients section by entering details view mode.
+    // The toolbar is hidden in ViewMode.base, so we must toggle it.
+    await tester.tap(find.byIcon(Icons.info_outline));
+    await tester.pumpAndSettle();
+
     final addButton = tester.widget<TextButton>(
       find.ancestor(
         of: find.byIcon(Icons.add),
         matching: find.byType(TextButton),
       ),
     );
+
     expect(addButton.onPressed, isNotNull);
   });
 }