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

test/core/utils/pagination_utils_test.dart

@@ -0,0 +1,125 @@
+import 'package:eatvio_app/core/utils/pagination_utils.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+class TestScrollNotification extends ScrollNotification {
+  final ScrollMetrics _metrics;
+
+  TestScrollNotification(this._metrics) : super(
+    metrics: _metrics,
+    context: null,
+  );
+
+  @override
+  ScrollMetrics get metrics => _metrics;
+}
+
+class TestScrollMetrics extends FixedScrollMetrics {
+  @override
+  final bool outOfRange;
+
+  TestScrollMetrics({
+    required super.minScrollExtent,
+    required super.maxScrollExtent,
+    required super.pixels,
+    required super.viewportDimension,
+    required super.axisDirection,
+    required super.devicePixelRatio,
+    required this.outOfRange,
+  });
+}
+
+void main() {
+  group('PaginationUtils', () {
+    test('loadNewContent - вызывает load когда достигнут порог', () {
+      bool loadCalled = false;
+      
+      final metrics = FixedScrollMetrics(
+        minScrollExtent: 0.0,
+        maxScrollExtent: 1000.0,
+        pixels: 850.0, // 1000 - 150 = 850 (порог)
+        viewportDimension: 100.0,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1.0,
+      );
+      
+      final notification = TestScrollNotification(metrics);
+
+      loadNewContent(notification, () {
+        loadCalled = true;
+        return Future.value();
+      });
+
+      expect(loadCalled, isTrue);
+    });
+
+    test('loadNewContent - не вызывает load когда не достигнут порог', () {
+      bool loadCalled = false;
+      
+      final metrics = FixedScrollMetrics(
+        minScrollExtent: 0.0,
+        maxScrollExtent: 1000.0,
+        pixels: 700.0, // меньше порога
+        viewportDimension: 100.0,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1.0,
+      );
+      
+      final notification = TestScrollNotification(metrics);
+
+      loadNewContent(notification, () {
+        loadCalled = true;
+        return Future.value();
+      });
+
+      expect(loadCalled, isFalse);
+    });
+
+    test('loadNewContent - не вызывает load когда outOfRange', () {
+      bool loadCalled = false;
+      
+      // Создаем метрики с outOfRange = true
+      final metrics = TestScrollMetrics(
+        minScrollExtent: 0.0,
+        maxScrollExtent: 1000.0,
+        pixels: 850.0, // на пороге, но outOfRange = true
+        viewportDimension: 100.0,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1.0,
+        outOfRange: true,
+      );
+      
+      final notification = TestScrollNotification(metrics);
+
+      loadNewContent(notification, () {
+        loadCalled = true;
+        return Future.value();
+      });
+
+      expect(loadCalled, isFalse);
+    });
+
+    test('loadNewContent - вызывает load точно на пороге', () {
+      bool loadCalled = false;
+      
+      final metrics = FixedScrollMetrics(
+        minScrollExtent: 0.0,
+        maxScrollExtent: 1000.0,
+        pixels: 850.0, // точно на пороге (1000 - 150)
+        viewportDimension: 100.0,
+        axisDirection: AxisDirection.down,
+        devicePixelRatio: 1.0,
+      );
+      
+      final notification = TestScrollNotification(metrics);
+
+      loadNewContent(notification, () {
+        loadCalled = true;
+        return Future.value();
+      });
+
+      expect(loadCalled, isTrue);
+    });
+  });
+}
+

test/core/utils/string_extentions_test.dart

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+import 'package:eatvio_app/core/utils/string_extentions.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('String Capitalization Extension', () {
+    test('capitalize - делает первую букву заглавной, остальные строчными', () {
+      expect('hello'.capitalize(), 'Hello');
+      expect('WORLD'.capitalize(), 'World');
+      expect('tEsT'.capitalize(), 'Test');
+      expect('a'.capitalize(), 'A');
+    });
+
+    test('capitalize - работает с пустой строкой', () {
+      expect(''.capitalize(), '');
+    });
+
+    test('capitalize - работает с одной буквой', () {
+      expect('h'.capitalize(), 'H');
+      expect('H'.capitalize(), 'H');
+    });
+
+    test('parseGender - преобразует "male" в "Мужской"', () {
+      expect('male'.parseGender(), 'Мужской');
+    });
+
+    test('parseGender - преобразует "female" в "Женский"', () {
+      expect('female'.parseGender(), 'Женский');
+    });
+
+    test('parseGender - возвращает исходную строку для других значений', () {
+      expect('other'.parseGender(), 'other');
+      expect('unknown'.parseGender(), 'unknown');
+      expect(''.parseGender(), '');
+    });
+
+    test('parseGender - регистрозависимый', () {
+      expect('Male'.parseGender(), 'Male');
+      expect('FEMALE'.parseGender(), 'FEMALE');
+      expect('Male'.parseGender(), isNot('Мужской'));
+    });
+  });
+}
+