diff --git a/tests/entities/test_collection.py b/tests/entities/test_collection.py
index 0bd4648..c4d8801 100644
--- a/tests/entities/test_collection.py
+++ b/tests/entities/test_collection.py
@@ -192,10 +192,3 @@ def test_cited_by_year():
     assert res.get(2021) == 12
     assert res.get(2022) == 2
     assert res.get(2023) == 0
-
-
-def test_primary_year():
-    collection = Collection(articles=articles)
-
-    res = collection.primary_year
-    assert res == 2000