feat: expose sort_columns in paginated response (#225)

tests/test_crud.py

@@ -247,6 +247,45 @@ class TestResolveSearchColumns:
         assert "username" not in result
 
 
+class TestResolveSortColumns:
+    """Tests for _resolve_sort_columns logic."""
+
+    def test_returns_none_when_no_order_fields(self):
+        """Returns None when cls.order_fields is None and no order_fields passed."""
+
+        class AbstractCrud(AsyncCrud[User]):
+            pass
+
+        assert AbstractCrud._resolve_sort_columns(None) is None
+
+    def test_returns_none_when_empty_order_fields_passed(self):
+        """Returns None when an empty list is passed explicitly."""
+        crud = CrudFactory(User)
+        assert crud._resolve_sort_columns([]) is None
+
+    def test_returns_keys_from_class_order_fields(self):
+        """Returns sorted column keys from cls.order_fields when no override passed."""
+        crud = CrudFactory(User, order_fields=[User.username])
+        result = crud._resolve_sort_columns(None)
+        assert result is not None
+        assert "username" in result
+
+    def test_order_fields_override_takes_priority(self):
+        """Explicit order_fields override cls.order_fields."""
+        crud = CrudFactory(User, order_fields=[User.username])
+        result = crud._resolve_sort_columns([User.email])
+        assert result is not None
+        assert "email" in result
+        assert "username" not in result
+
+    def test_returns_sorted_keys(self):
+        """Keys are returned in sorted order."""
+        crud = CrudFactory(User, order_fields=[User.email, User.username])
+        result = crud._resolve_sort_columns(None)
+        assert result is not None
+        assert result == sorted(result)
+
+
 class TestDefaultLoadOptionsIntegration:
     """Integration tests for default_load_options with real DB queries."""