feat(tests): updated tests coverage to 66.5%

test/features/blog_post/presentation/cubit/blog_post_state_test.dart

@@ -60,6 +60,32 @@ void main() {
       expect(state.isLoading, isFalse);
       expect(state.error, isNull);
     });
+
+    test('toJson serializes BlogPostState correctly', () {
+      final state = BlogPostState(
+        blogPostModel: null,
+        isLoading: false,
+        error: null,
+      );
+
+      final json = state.toJson();
+
+      expect(json['isLoading'], isFalse);
+      expect(json['error'], isNull);
+      expect(json.containsKey('blogPostModel'), isTrue);
+    });
+
+    test('copyWith creates new instance with updated values', () {
+      final original = BlogPostState();
+      final updated = original.copyWith(
+        isLoading: true,
+        error: 'Test error',
+      );
+
+      expect(updated.isLoading, isTrue);
+      expect(updated.error, 'Test error');
+      expect(updated.blogPostModel, original.blogPostModel);
+    });
   });
 }