diff --git a/test/calculus/random/test_list_generator.py b/test/calculus/random/test_list_generator.py
index 2960fcd..9b8a9a5 100644
--- a/test/calculus/random/test_list_generator.py
+++ b/test/calculus/random/test_list_generator.py
@@ -26,9 +26,9 @@ def test_generate_list_calculus_math():
     import math
     a, b, gcd = mapytex.random.list(["a", "b", "gcd(a, b)"])
     assert math.gcd(a, b) == gcd
-    a, b, exp, log = mapytex.random.list(["a", "b", "exp(a)", "log(b)"])
+    a, b, exp, cos = mapytex.random.list(["a", "b", "exp(a)", "cos(b)"])
     assert math.exp(a) == exp
-    assert math.log(b) == log
+    assert math.cos(b) == cos
 
 
 def test_generate_list_conditions():