diff --git a/dp_creator_ii/tests/test_app.py b/dp_creator_ii/tests/test_app.py
index 24947f9..27b4f19 100644
--- a/dp_creator_ii/tests/test_app.py
+++ b/dp_creator_ii/tests/test_app.py
@@ -26,6 +26,7 @@ def expect_not_visible(text):
     expect_visible(pick_dataset_text)
     expect_not_visible(perform_analysis_text)
     expect_not_visible(download_results_text)
+    expect_not_visible("expected str, bytes")
 
     csv_path = Path(__file__).parent / "fixtures" / "fake.csv"
     page.get_by_label("Choose CSV file").set_input_files(csv_path.resolve())