Update tests/utils/test_helpers.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: cchinchilla-dev

tests/utils/test_helpers.py

@@ -467,12 +467,12 @@ def test_clean_empty_mixed(input_val, expected):
 def test_clean_empty_does_not_mutate_input():
     """_clean_empty should not mutate the original input object."""
     original = {'a': '', 'b': 1, 'c': {'d': ''}}
-    copy = {
+    original_copy = {
         'a': '',
         'b': 1,
         'c': {'d': ''},
     }
 
     _clean_empty(original)
 
-    assert original == copy
+    assert original == original_copy