diff --git a/test/functional/python/test_cell.py b/test/functional/python/test_cell.py
index a2853865..bc81cfa2 100644
--- a/test/functional/python/test_cell.py
+++ b/test/functional/python/test_cell.py
@@ -4,5 +4,5 @@
 
 def test_expand_cell():
     with pytest.raises(TypeError) as e:
-        _expand_cell(None)
-    assert e.value
+        _expand_cell(([], [], [], [], []))
+    assert str(e.value) == "cell has to be a tuple of 3 or 4 elements."