feat(dependencies): add rxdart package and improve string extension methods for better handling of empty strings and gender parsing

test/features/plans/models/chosen_plan_model_test.dart

@@ -0,0 +1,54 @@
+import 'package:eatvio_app/features/feed/models/diets_pagination_model.dart';
+import 'package:eatvio_app/features/feed/models/plan_pagination_model.dart';
+import 'package:eatvio_app/features/plans/enums/chosen_plan_state_enum.dart';
+import 'package:eatvio_app/features/plans/models/chosen_plan_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('ChosenPlanModel', () {
+    test('создает ChosenPlanModel с правильными значениями', () {
+      const plan = PlanModel(
+        id: 1,
+        slug: 'test-plan',
+        name: 'Test Plan',
+        image: 'https://example.com/image.jpg',
+        duration: 7,
+        state: 'active',
+        type: PlanType(fit: true, slim: false, behavior: false, wellness: false),
+        details: 'Test details',
+        packetsCount: 3,
+        author: Author(
+          authorSlug: 'author',
+          authorName: 'Author Name',
+          authorProfileIcon: 'https://example.com/icon.jpg',
+          authorIsMe: false,
+          isEntitySubscribedByMe: null,
+          authorPlaceInRating: null,
+        ),
+        totalLikes: 10,
+        totalViews: 100,
+        totalComments: 5,
+        isFavorite: false,
+        minPriceOfOptions: 1000,
+        maxPriceOfOptions: 2000,
+        wasLikedByMe: false,
+      );
+
+      final chosenPlan = ChosenPlanModel(
+        id: 1,
+        optionType: 'options1',
+        startDate: DateTime(2024, 1, 1),
+        chosenPlanState: ChosenPlanStateEnum.stateInited,
+        chatId: 'chat-1',
+        consultantId: 1,
+        plan: plan,
+      );
+
+      expect(chosenPlan.id, 1);
+      expect(chosenPlan.optionType, 'options1');
+      expect(chosenPlan.chosenPlanState, ChosenPlanStateEnum.stateInited);
+      expect(chosenPlan.plan.id, 1);
+    });
+  });
+}
+