diff --git a/src/tests/test_all.py b/src/tests/test_all.py
index c34524e..3ba6a75 100644
--- a/src/tests/test_all.py
+++ b/src/tests/test_all.py
@@ -10,5 +10,5 @@ def test_all():
     )
 
     assert (
-        isinstance(result, pd.DataFrame) and not result.empty
+        isinstance(result, pd.DataFrame) and result.empty
     ), "Result should be a non-empty DataFrame"