Update error message

Author: classiqdor

tests/internal/test_notebook_unique_name.py

@@ -1,3 +1,4 @@
+from collections import Counter
 from pathlib import Path
 from typing import Iterable
 
@@ -6,14 +7,14 @@
 
 def test_unique_notebook_name():
     all_notebooks = ROOT.rglob("*.ipynb")
-    assert _are_all_base_names_unique(all_notebooks)
+    assert not duplicate_base_names(all_notebooks)
 
 
 def test_unique_qmod_name():
     all_qmods = ROOT.rglob("*.qmod")
-    assert _are_all_base_names_unique(all_qmods)
+    assert not duplicate_base_names(all_qmods)
 
 
-def _are_all_base_names_unique(files: Iterable[Path]) -> bool:
+def duplicate_base_names(files: Iterable[Path]) -> bool:
     base_names = [f.name for f in files]
-    return len(base_names) == len(set(base_names))
+    return [name for name, count in Counter(base_names) if count > 1]