diff --git a/tests/combinatorics/test_combinatorics.py b/tests/combinatorics/test_combinatorics.py
index 77b4a42..1fd3e54 100644
--- a/tests/combinatorics/test_combinatorics.py
+++ b/tests/combinatorics/test_combinatorics.py
@@ -1,12 +1,10 @@
 from pyrival.combinatorics import combinatorics
 
 def test_catalan_recursive(catalan):
-    assert all(combinatorics.catalan_recursive(i) == j for i, j in enumerate(A))
-
+    assert all(combinatorics.catalan_recursive(i) == j for i, j in enumerate(catalan))
 
 def test_derangements(derangements):
-    assert all(combinatorics.derangements(i) == j for i, j in enumerate(A))
-
+    assert all(combinatorics.derangements(i) == j for i, j in enumerate(derangements))
 
 def test_catalan(catalan):
-    assert all(combinatorics.catalan(i) == j for i, j in enumerate(A))
+    assert all(combinatorics.catalan(i) == j for i, j in enumerate(catalan))