feat(tests): updated tests coverage to 66.5%

test/features/plans/models/chosen_plan_model_test.dart

@@ -93,6 +93,53 @@ void main() {
       expect(chosenPlan.chosenPlanState, ChosenPlanStateEnum.stateInited);
       expect(chosenPlan.chatId, 'chat-1');
     });
+
+    test('toJson serializes ChosenPlanModel correctly', () {
+      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,
+      );
+
+      final json = chosenPlan.toJson();
+
+      expect(json['id'], 1);
+      expect(json['option_type'], 'options1');
+      expect(json['chat_id'], 'chat-1');
+      expect(json['consultant_id'], 1);
+      expect(json.containsKey('plan'), isTrue);
+    });
   });
 
   group('parseChosenPlan', () {