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

test/features/cancel_plan_bottom_sheet/models/cancelation_model_test.dart

@@ -0,0 +1,29 @@
+import 'package:eatvio_app/features/cancel_plan_bottom_sheet/models/cancelation_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('CancelationModel', () {
+    test('создает CancelationModel с правильными значениями', () {
+      final model = CancelationModel(
+        description: 'Test reason',
+        price: 1000,
+      );
+
+      expect(model.description, 'Test reason');
+      expect(model.price, 1000);
+    });
+
+    test('fromJson создает CancelationModel из JSON', () {
+      final json = {
+        'description': 'Test reason',
+        'price': 1000,
+      };
+
+      final model = CancelationModel.fromJson(json);
+
+      expect(model.description, 'Test reason');
+      expect(model.price, 1000);
+    });
+  });
+}
+