work on test models part 1

test/model/feedback_stats_test.dart

@@ -0,0 +1,52 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tm_app/data/services/model/feedback_stats/feedback_stats.dart';
+
+void main() {
+  group('FeedbackStats Model Tests', () {
+    final mockJson = {
+      'company_id': 'cmp123',
+      'last_updated': 1710000000,
+      'total_dislikes': 3,
+      'total_feedback': 25,
+      'total_likes': 22,
+    };
+
+    test('fromJson creates valid FeedbackStats instance', () {
+      final stats = FeedbackStats.fromJson(mockJson);
+
+      expect(stats.companyId, equals('cmp123'));
+      expect(stats.lastUpdated, equals(1710000000));
+      expect(stats.totalDislikes, equals(3));
+      expect(stats.totalFeedback, equals(25));
+      expect(stats.totalLikes, equals(22));
+    });
+
+    test('toJson converts model back to JSON correctly', () {
+      final stats = FeedbackStats.fromJson(mockJson);
+      final json = stats.toJson();
+
+      expect(json['company_id'], 'cmp123');
+      expect(json['last_updated'], 1710000000);
+      expect(json['total_dislikes'], 3);
+      expect(json['total_feedback'], 25);
+      expect(json['total_likes'], 22);
+    });
+
+    test('copyWith correctly updates fields', () {
+      final stats = FeedbackStats.fromJson(mockJson);
+      final updated = stats.copyWith(totalLikes: 30, totalDislikes: 10);
+
+      expect(updated.totalLikes, 30);
+      expect(updated.totalDislikes, 10);
+      expect(updated.companyId, 'cmp123');
+    });
+
+    test('equality operator works correctly', () {
+      final s1 = FeedbackStats.fromJson(mockJson);
+      final s2 = FeedbackStats.fromJson(mockJson);
+
+      expect(s1, equals(s2));
+      expect(s1.hashCode, equals(s2.hashCode));
+    });
+  });
+}