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

test/features/registration/models/location_model_test.dart

@@ -0,0 +1,30 @@
+import 'package:eatvio_app/features/registration/models/location_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('LocationModel', () {
+    test('создает LocationModel с правильными значениями', () {
+      const model = LocationModel(
+        locations: ['Moscow', 'Saint Petersburg'],
+        responseBody: '{}',
+      );
+
+      expect(model.locations.length, 2);
+      expect(model.locations.first, 'Moscow');
+      expect(model.responseBody, '{}');
+    });
+
+    test('fromJson создает LocationModel из JSON', () {
+      final json = {
+        'locations': ['Moscow', 'Saint Petersburg'],
+        'response_body': '{}',
+      };
+
+      final model = LocationModel.fromJson(json);
+
+      expect(model.locations.length, 2);
+      expect(model.responseBody, '{}');
+    });
+  });
+}
+