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

test/features/profile/models/sub_model_test.dart

@@ -0,0 +1,62 @@
+import 'package:eatvio_app/core/models/pagination_model.dart';
+import 'package:eatvio_app/features/profile/models/sub_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('SubModel', () {
+    test('создает SubModel с правильными значениями', () {
+      final model = SubModel(
+        slug: 'user-slug',
+        name: 'User Name',
+        city: 'Moscow',
+        birthdate: DateTime(1990, 1, 1),
+        isEntitySubscribedByMe: true,
+        profilePhotoUrl: 'https://example.com/photo.jpg',
+        roles: ['consultant'],
+      );
+
+      expect(model.slug, 'user-slug');
+      expect(model.name, 'User Name');
+      expect(model.city, 'Moscow');
+      expect(model.isEntitySubscribedByMe, isTrue);
+      expect(model.roles, ['consultant']);
+    });
+  });
+
+  group('SubPaginationModel', () {
+    test('создает SubPaginationModel с правильными значениями', () {
+      final sub = SubModel(
+        slug: 'user-slug',
+        name: 'User Name',
+        city: 'Moscow',
+        birthdate: DateTime(1990, 1, 1),
+        isEntitySubscribedByMe: true,
+        profilePhotoUrl: 'https://example.com/photo.jpg',
+        roles: ['consultant'],
+      );
+
+      final pagination = SubPaginationModel(
+        data: [sub],
+        links: const Links(
+          first: 'https://example.com?page=1',
+          last: 'https://example.com?page=1',
+          prev: null,
+          next: null,
+        ),
+        meta: const Meta(
+          currentPage: 1,
+          from: 1,
+          lastPage: 1,
+          links: [],
+          perPage: 10,
+          to: 1,
+          total: 1,
+        ),
+      );
+
+      expect(pagination.data.length, 1);
+      expect(pagination.data.first.slug, 'user-slug');
+    });
+  });
+}
+