diff --git a/tests/test_fetch_doi_mock.py b/tests/test_fetch_doi_mock.py
index d63effe..ecdd7b5 100644
--- a/tests/test_fetch_doi_mock.py
+++ b/tests/test_fetch_doi_mock.py
@@ -97,11 +97,6 @@ def test_subject_mapper(fake_openalex_response):
     # Extract topics from the OpenAlex response
     topics = fake_openalex_response.get("topics", [])
 
-    # Convert topics to strings - we'll use display_name
-    topic_names = []
-    if topics:
-        topic_names = [topic.get("display_name") for topic in topics if topic.get("display_name")]
-
     # Get subjects using the class method
     subjects = SubjectMapper.get_subjects({"topics": topics})