diff --git a/narwhals/_arrow/dataframe.py b/narwhals/_arrow/dataframe.py
index 401834bcf..e433a0535 100644
--- a/narwhals/_arrow/dataframe.py
+++ b/narwhals/_arrow/dataframe.py
@@ -161,7 +161,7 @@ def __getitem__(
                         )
                     )
                 msg = f"Expected slice of integers of strings, got: {type(item[1])}"  # pragma: no cover
-                raise TypeError(msg)
+                raise TypeError(msg)  # pragma: no cover
 
             from narwhals._arrow.series import ArrowSeries
 
diff --git a/narwhals/_pandas_like/dataframe.py b/narwhals/_pandas_like/dataframe.py
index 7bc413c1b..7d4a700d1 100644
--- a/narwhals/_pandas_like/dataframe.py
+++ b/narwhals/_pandas_like/dataframe.py
@@ -168,7 +168,7 @@ def __getitem__(
                     ]
                 )
             msg = f"Expected slice of integers of strings, got: {type(item[1])}"  # pragma: no cover
-            raise TypeError(msg)
+            raise TypeError(msg)  # pragma: no cover
 
         elif isinstance(item, tuple) and len(item) == 2:
             from narwhals._pandas_like.series import PandasLikeSeries
diff --git a/narwhals/_polars/dataframe.py b/narwhals/_polars/dataframe.py
index 0045a1f1c..b7c781659 100644
--- a/narwhals/_polars/dataframe.py
+++ b/narwhals/_polars/dataframe.py
@@ -108,7 +108,7 @@ def __getitem__(self, item: Any) -> Any:
                     ).__getitem__(item[0])
                 )
             msg = f"Expected slice of integers of strings, got: {type(item[1])}"  # pragma: no cover
-            raise TypeError(msg)
+            raise TypeError(msg)  # pragma: no cover
         pl = get_polars()
         result = self._native_frame.__getitem__(item)
         if isinstance(result, pl.Series):